5x−10y5x-10y5x−10y + x2−4xy+4y2x^2-4xy+4y^2x2−4xy+4y2 5x−2yx-2yx−2y + x−2yx-2yx−2y^2x−2yx-2yx−2y5+x−2y5 + x-2y5+x−2y
5x−10y5x-10y5x−10y + x2−4xy+4y2x^2-4xy+4y^2x2−4xy+4y2 5x−2yx-2yx−2y + x−2yx-2yx−2y^2
x−2yx-2yx−2y5+x−2y5 + x-2y5+x−2y