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(X-4)(X-7)(X-2)(X+1)=16
We move all terms to the left:
(X-4)(X-7)(X-2)(X+1)-(16)=0
We multiply parentheses ..
(+X^2-7X-4X+28)(X-2)(X+1)-16=0
We multiply parentheses ..
(+X^2-7X-4X+28)(+X^2+X-2X-2)-16=0
We move all terms containing X to the left, all other terms to the right
(+X^2-7X-4X+28)(+X^2+X-2X-2)=16
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