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(x+3)(x+2)(x+1)=720
We move all terms to the left:
(x+3)(x+2)(x+1)-(720)=0
We multiply parentheses ..
(+x^2+2x+3x+6)(x+1)-720=0
We move all terms containing x to the left, all other terms to the right
(+x^2+2x+3x+6)(x+1)=720
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