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(X+1)(X+2)=X2+6X-10
We move all terms to the left:
(X+1)(X+2)-(X2+6X-10)=0
We add all the numbers together, and all the variables
-(+X^2+6X-10)+(X+1)(X+2)=0
We get rid of parentheses
-X^2-6X+(X+1)(X+2)+10=0
We multiply parentheses ..
-X^2+(+X^2+2X+X+2)-6X+10=0
We add all the numbers together, and all the variables
-1X^2+(+X^2+2X+X+2)-6X+10=0
We get rid of parentheses
-1X^2+X^2+2X+X-6X+2+10=0
We add all the numbers together, and all the variables
-3X+12=0
We move all terms containing X to the left, all other terms to the right
-3X=-12
X=-12/-3
X=+4
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