factor (z+x-y)(xz-y2)-x2(xz-y2)+(z-x-y)(x2-y2)

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Given (z+x-y)(xz-y2)-x2(xz-y2)+(z-x-y)(x2-y2)
=>xz^2-y^2z+x^2z-xy^2-xyz+y^3-x^3z-x^2y^2+zx^2-zy^2-x^3+xy^2-yx^2+y^3
=>x^3(-z)-x^3+x^2y^2-x^2y+2x^2z-xyz+xz^2+2y^3-2y^2z

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