
Kenneth S. answered 02/11/18
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change the two different expressions that are enclosed in parentheses so that a common denominator is used in each case.
those denominators will be opposites, and so they will in effect cancel "-1" times, when the divisor is inverted to achieve the desired division by doing multiplication by the divisor's reciprocal..
with careful work, this might simplify very nicely.

Kenneth S.
= (y-x)/(xy) ÷ 5(x-y)/(xy) = - 1/5
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02/11/18
Roelof D.
02/11/18