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x^3 + 3x^2 - 4x + 12= ///
2xy^2 - 5xy + 10x^y - 5x^2 y^2= xy(2y-5+120-5xy)
x^6 - x^2= (x^3-x)(x^3+x)
x^3 - 1= (x-1)(x^2+x+1)