When x is added to the numerator and subtracted from the denominator of the fraction a/b, where a does not equal 0 and b does not equal 0, the value of the fraction is changed to c/d. Find x.

Question

anonymous · Answer

Well, since x is added to the numerator and subtracted from the denominator of the fraction a/b...
a + x       c
----- = ----
b - x        d

anonymous · Answer

Set a + x to be equal to c and b - x to be equal to d...

anonymous · Answer

Okay, i did that. Can I cross multiply in this situation?

anonymous · Answer

You could, but it would make things a bit more complicated

anonymous · Answer

So what's the first step? I'm not sure where to start.