i need help do i need a common denominator?
Nope. =) This really just becomes (x/x+y) / (x/1). This is (x/x+y) divided by x, so the x's cancel out and you have 1/(x+y).
(x/x+y) / (x)
= [x / (x+y)] * 1/(x)
= 1 / (x+y)
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