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3x'3-7x'2+4 =3x^3-3x^2-4x^2+4 =3x^2(x-1)-4(x^2-1) =3x^2(x-1)-4(x+1)(x-1) =(3x^2-4x-4)(x-1) =(3x+2)(x-2)(x-1)
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