# algebra

I don’t really understand this and it is on a test;
w-4/w-9 – w+1/w+9 + w-99/w^2 – 18 =

Can anyone give me a hint...please

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1. Are you sure the last denominator isn't w^2 - 81? You get a simpler answer if is is, becasue it happens to be the lowest common denominator.

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