is completely meaningless.
The bracket isn't matching anything, mbBrand is a string so it's just "sitting there" all on it's own, keyboard.nextLine is a method.
Probably what you meant was:
mbBrand = keyboard.nextLine();
And there is a good chance that fixing that with fix your other errors.
But if you have been staring at that for "a few hours" trying to fix it, then you probably need to re-read your course materials from the beginning a few times before you go any further!