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(x-1)(x-5)(x+8)(x+2)=880
We move all terms to the left:
(x-1)(x-5)(x+8)(x+2)-(880)=0
We multiply parentheses ..
(+x^2-5x-1x+5)(x+8)(x+2)-880=0
We multiply parentheses ..
(+x^2-5x-1x+5)(+x^2+2x+8x+16)-880=0
We move all terms containing x to the left, all other terms to the right
(+x^2-5x-1x+5)(+x^2+2x+8x+16)=880
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