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(x+1)(x+2)(x+3)=129
We move all terms to the left:
(x+1)(x+2)(x+3)-(129)=0
We multiply parentheses ..
(+x^2+2x+x+2)(x+3)-129=0
We move all terms containing x to the left, all other terms to the right
(+x^2+2x+x+2)(x+3)=129
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