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@x^{3} +x^{2} -4x-4x^{2} (x+1)-4(x+1)(x^{2}-4 )(x+1)frac{=(x-2)(x+2)(x+1)}{AVS} 3x^{3}-x^{2} -3x+1=x^{2} (3x-1)-1(3x-1)=(3x-1)(x^{2} -1)(x+1)(x-1)(3x-1)