Question 985286
Maybe you have this:
(a+x)/(a-x) = (b-y)/(b+y)


rendered to look like this:
{{{(a+x)/(a-x) = (b-y)/(b+y)}}}


Simplest common denominator is  {{{(a-x)(b+y)}}}.


{{{(a-x)(b+y)((a+x)/(a-x))=(a-x)(b+y)((b-y)/(b+y))}}}

Simplify and go from there.




---
RESULT:  {{{highlight(x=ay/b)}}}