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X2+X-(-2X)=X2+12
We move all terms to the left:
X2+X-(-2X)-(X2+12)=0
We add all the numbers together, and all the variables
-(+X^2+12)+X2+X-(-2X)=0
We add all the numbers together, and all the variables
X^2-(+X^2+12)+X-(-2X)=0
We get rid of parentheses
X^2-X^2+X+2X-12=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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