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(X+1)(X+2)(X+3)(X+4)=720
We move all terms to the left:
(X+1)(X+2)(X+3)(X+4)-(720)=0
We multiply parentheses ..
(+X^2+2X+X+2)(X+3)(X+4)-720=0
We multiply parentheses ..
(+X^2+2X+X+2)(+X^2+4X+3X+12)-720=0
We move all terms containing X to the left, all other terms to the right
(+X^2+2X+X+2)(+X^2+4X+3X+12)=720
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