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