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.X^2+13X+12=(X+1)(X+
We move all terms to the left:
.X^2+13X+12-((X+1)(X+)=0
We add all the numbers together, and all the variables
.X^2+13X-((X+1)(+X)+12=0
We add all the numbers together, and all the variables
13X-((X+1)(+X)+12=0
We multiply parentheses ..
-((+X^2+X)+12+13X=0
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