1) (x^-2xy+y^)(x-y) = x^2 - 2xy^2 + xy^2 - y^2 = x^2 - y^2
2) (x-5)(2x+3)-2x(x-3)+x+7 = 2x^2 + 3x - 10x - 15 -2x^2 + 6x + x + 7 = x + -8
1) (x^-2xy+y^)(x-y) = x^2 - 2xy^2 + xy^2 - y^2 = x^2 - y^2
2) (x-5)(2x+3)-2x(x-3)+x+7 = 2x^2 + 3x - 10x - 15 -2x^2 + 6x + x + 7 = x + -8