(x-4)(x+1)(x+2)(x+7)+56=0
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(x-4)(x+1)(x+2)(x+7)+56=0
![(x-4)(x+1)(x+2)(x+7)+56=0](/uploads/image/z/1906929-9-9.jpg?t=%28x-4%29%28x%2B1%29%28x%2B2%29%28x%2B7%29%2B56%3D0)
(x-4)(x+1)(x+2)(x+7)+56=0
(x-4)(x+7)(x+1)(x+2)+56=0
(x²+3x-28)(x²+3x+2)+56=0
(x²+3x-28)²+30(x²+3x-28)+56=0
(x²+3x)(x²+3x-26)=0
x(x+3)(x²+3x-26)=0
(x-4)(x+7)(x+1)(x+2)+56=0
(x²+3x-28)(x²+3x+2)+56=0
(x²+3x-28)²+30(x²+3x-28)+56=0
(x²+3x)(x²+3x-26)=0
x(x+3)(x²+3x-26)=0
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3x(7-2x)+5x(2x-1)=4x(x-3)+56
x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002
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