(x^2-y^2) = (x+y)(x-y)
x^2-2xy+y^2 = (x-y)(x-y)
so when you divide the first by the second you get
Now work on the bottom
(3x+3y) = 3(x+y)
Now turn that upside down and multiply by the numerator
7(x-3) /3(x+y) * (x+y)/(x-y)
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