How to find exact match of the string using findstr

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batch

I tried to find exact string from the file and increment the value of it. Content be like of file:

version=10
subversion=20


if I search version it increment the value of subversion.

What I have tried:

for /F "tokens=1,* delims==" %%i in ('findstr "version=  " file.ini') do (
	
    set "versionVar=%%~i"
    set "versionVal=%%~j"
    set  sequence=%%~j+1 
	)
	for /f "tokens=1,*delims=]" %%i in ('type "%file%" ^| find /v /n "" ^& break^>%file%') do (
    set "line=%%j"
    if "!line!" == "!versionVar!=!versionVal!" set line=!versionVar!=!sequence!
    echo(!line!>>!file!
	)