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(x+2)(x-4)(2x+1)=680
We move all terms to the left:
(x+2)(x-4)(2x+1)-(680)=0
We multiply parentheses ..
(+x^2-4x+2x-8)(2x+1)-680=0
We move all terms containing x to the left, all other terms to the right
(+x^2-4x+2x-8)(2x+1)=680
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