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(x+2)(x-3)(x+7)(x-8)=336
We move all terms to the left:
(x+2)(x-3)(x+7)(x-8)-(336)=0
We multiply parentheses ..
(+x^2-3x+2x-6)(x+7)(x-8)-336=0
We multiply parentheses ..
(+x^2-3x+2x-6)(+x^2-8x+7x-56)-336=0
We move all terms containing x to the left, all other terms to the right
(+x^2-3x+2x-6)(+x^2-8x+7x-56)=336
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