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(x-1)(x-3)(x+2)(x-6)+18=0
We multiply parentheses ..
(+x^2-3x-1x+3)(x+2)(x-6)+18=0
We multiply parentheses ..
(+x^2-3x-1x+3)(+x^2-6x+2x-12)+18=0
We move all terms containing x to the left, all other terms to the right
(+x^2-3x-1x+3)(+x^2-6x+2x-12)=-18
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