Subtract 3x3+xy-7y2from x2-7xy+8y-3y2
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Answer: (x^2-3y^2-7xy+8y) - (3x^3-7y^2+ xy)
= x^2-3y^2-7xy+8y -3x^3+7y^2- xy
= -3x^3+x^2-3y^2+7y^2-7xy-xy+8y
= -3x^3+x^2+4y^2-8xy+8y
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