(x-y)/(x+3y)*(x²+6xy+9y²)/(x²-y²)-2y/(x+y)

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(x-y)/(x+3y)*(x²+6xy+9y²)/(x²-y²)-2y/(x+y)
(x-y)/(x+3y)*(x²+6xy+9y²)/(x²-y²)-2y/(x+y)

(x-y)/(x+3y)*(x²+6xy+9y²)/(x²-y²)-2y/(x+y)
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