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