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Welcome aboard! 
The difficult we do right away...
...the impossible takes slightly longer.
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Welcome, most of us are house broke.
Everyone has a photographic memory; some just don't have film. Steven Wright
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Well, broke anyway.
Sent from my Amstrad PC 1640
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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Don't know about you but I'm broke and broke...more broke than broke though!
Everyone has a photographic memory; some just don't have film. Steven Wright
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I live in an old(*), broken-down house. Does that count?
(*) Front half of the house, built in 1872. In 1892, moved to its current location ½ a mile away. 1920's, built on the rear portion of the house, including dining room, kitchen, and laundry. Has spent all those years settling at various rates on/around the supports in the basement. No redeeming architectural features whatsoever. 
Software Zen: delete this;
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Yes will give you a waiver.
Everyone has a photographic memory; some just don't have film. Steven Wright
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Don't waive too hard please, something might fall off and hurt someone.
Software Zen: delete this;
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I'm old, all the pieces that are going to fall off have a long time ago.
Everyone has a photographic memory; some just don't have film. Steven Wright
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Your questions about father newbie are always welcome, and also feel free to ask about father Christmas
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Cordelias House wrote: and asking some father newbie questions to start with
Welcome, but I am NOT your father! 
Latest Article - A Concise Overview of Threads
Learning to code with python is like learning to swim with those little arm floaties. It gives you undeserved confidence and will eventually drown you. - DangerBunny
Artificial intelligence is the only remedy for natural stupidity. - CDP1802
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Last week while working on a new report, I needed a formula that would calculate a shortage/overage for a variable and had the equation worked out as follows:
a/(a+b) = c/d where I was solving for the variable a.
It's been 30 years since I had algebra, and I struggled with a half dozen attempts at getting 'a' by itself on the left side, but nothing checked out.
On a hunch, I did a quick google search and found this:
https://www.mathway.com/Algebra[^]
All you do is type in your formula, then it asks which variable you want to solve for. Brilliant!
"Go forth into the source" - Neal Morse
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Handy - and quick too!
Can I suggest an extra posting here: Free Tools Discussion Boards[^] - it doesn't get scrolled into oblivion so quickly there.
Sent from my Amstrad PC 1640
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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Done!
"Go forth into the source" - Neal Morse
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Heck, if it's any more difficult than a + b = c solve for a I'm stuck (I can barely manage the c)! 
I never liked math and math dislikes me right back
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Very nice, put that away for safe keeping! Thanks
Everyone has a photographic memory; some just don't have film. Steven Wright
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Wolfram alpha also does this for you:
http://www.wolframalpha.com/input/?i=solve+x%2F(x%2Bb)+%3D+c%2Fd
Matlab also has similar tools but that costs a lot of money.
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Thanks, tried out the wolfram alpha.  Too bad they also charge to see the steps.
"Go forth into the source" - Neal Morse
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It must be all of the algebra I taught over the years.... burned in my skull.
Now, can you derive the equation of a line given two points?
Muahahaha 
Charlie Gilley
<italic>Stuck in a dysfunctional matrix from which I must escape...
"Where liberty dwells, there is my country." B. Franklin, 1783
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
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charlieg wrote: Now, can you derive the equation of a line given two points?
Without looking slope = rise/run so m = (y2-y1)/(x2-x1) (probably not right at all)
Now you're making my brain hurt again! btw, after revisiting my original problem, and thinking a little harder, I was able to work it out.
"Go forth into the source" - Neal Morse
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It was rhetorical Slope is correct, but the y intercept?
I worked with a coder who was a wizard in C++. But he had no idea how to code a linear function to calculate a simulated value...
anyway, good math links
Charlie Gilley
<italic>Stuck in a dysfunctional matrix from which I must escape...
"Where liberty dwells, there is my country." B. Franklin, 1783
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
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 Thanks for the link. Bookmarked
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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It's trivial https://codeproject.global.ssl.fastly.net/script/Forums/Images/smiley_wink.gif, even after almost 60 years away from Grammar School in England. The steps are, using C formulae:
a / (a + b) = c / d
Multiply both sides by (a + b)
a = (a + b) * c / d
Collect the terms in a
a - a * c / d = b * c / d
Collect the coefficients of a
a * (1 - c / d) = b * c / d
Divide both sides by (1 - c / d)
a = b * c / d / (1 - c / d)
Simplify
a = b * c / (d - c)
Hope that's right, solved before you would have found the program
In those good old days you got the algebra beaten into you
Show-off Jerry
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... and c needs to be not equal to d ...
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