2x^3-x^2z-4x^2y+2xyz+2xy^2-y^2z
=x^2(2x-z)-2xy(2x-z)+y^2(2x-z)
=(x^2-2xy+y^2)(x-z)
=(x-y)^2(x-z)
2x^3-x^2z-4x^2y+2xyz+2xy^2-y^2z
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