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Subtract: 7/x-y - 2/y-x

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your answer is 9/(x-y) you want me to explain?
Yes do explain, cause the book his no questions like this one
see its simple 2/(y-x) can be written as -2/(x-y) you know this right?

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Other answers:

well and - - is +.. u there gal?
Im still here. (computer freezing alot)
ya.. so you can see -2/y-x=+2/x-y combining the two things i told above.. den u take 1/(x-y)common and add 2+7=9 to get 9/x-y as ur answer
hope it helps
Thanks. I am studying for my FINALS on Saturday. ~ And a lot of the question on the Sample Final sheet, I wasn't even thought.
Thanks for the help alot

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