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X^2+8X+12=(X+6)(X+12)
We move all terms to the left:
X^2+8X+12-((X+6)(X+12))=0
We multiply parentheses ..
X^2-((+X^2+12X+6X+72))+8X+12=0
We calculate terms in parentheses: -((+X^2+12X+6X+72)), so:We add all the numbers together, and all the variables
(+X^2+12X+6X+72)
We get rid of parentheses
X^2+12X+6X+72
We add all the numbers together, and all the variables
X^2+18X+72
Back to the equation:
-(X^2+18X+72)
X^2+8X-(X^2+18X+72)+12=0
We get rid of parentheses
X^2-X^2+8X-18X-72+12=0
We add all the numbers together, and all the variables
-10X-60=0
We move all terms containing X to the left, all other terms to the right
-10X=60
X=60/-10
X=-6
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