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(X+3)(X+7)(X+4)(X+6)=1120
We move all terms to the left:
(X+3)(X+7)(X+4)(X+6)-(1120)=0
We multiply parentheses ..
(+X^2+7X+3X+21)(X+4)(X+6)-1120=0
We multiply parentheses ..
(+X^2+7X+3X+21)(+X^2+6X+4X+24)-1120=0
We move all terms containing X to the left, all other terms to the right
(+X^2+7X+3X+21)(+X^2+6X+4X+24)=1120
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