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(x-2)(x+3)(x+1)(x+6)+56=0
We multiply parentheses ..
(+x^2+3x-2x-6)(x+1)(x+6)+56=0
We multiply parentheses ..
(+x^2+3x-2x-6)(+x^2+6x+x+6)+56=0
We move all terms containing x to the left, all other terms to the right
(+x^2+3x-2x-6)(+x^2+6x+x+6)=-56
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