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(2x+1)(2x-3)(x+4)=266
We move all terms to the left:
(2x+1)(2x-3)(x+4)-(266)=0
We multiply parentheses ..
(+4x^2-6x+2x-3)(x+4)-266=0
We move all terms containing x to the left, all other terms to the right
(+4x^2-6x+2x-3)(x+4)=266
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