2y+y^2-xy-(xy-y+3y^2)

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1 Answer

2y + y^2 - xy - (xy - y + 3y^2)
= 2y + y^2 - xy - xy + y - 3y^2
= (2y + y) + (y^2 - 3y^2) + (-xy - xy)
= 3y - 2y^2 - 2xy
by

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