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(X+1)(X-2)=X2+6
We move all terms to the left:
(X+1)(X-2)-(X2+6)=0
We add all the numbers together, and all the variables
-(+X^2+6)+(X+1)(X-2)=0
We get rid of parentheses
-X^2+(X+1)(X-2)-6=0
We multiply parentheses ..
-X^2+(+X^2-2X+X-2)-6=0
We add all the numbers together, and all the variables
-1X^2+(+X^2-2X+X-2)-6=0
We get rid of parentheses
-1X^2+X^2-2X+X-2-6=0
We add all the numbers together, and all the variables
-1X-8=0
We move all terms containing X to the left, all other terms to the right
-X=8
X=8/-1
X=-8
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