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X^2+8X-12=X^2+12X-36
We move all terms to the left:
X^2+8X-12-(X^2+12X-36)=0
We get rid of parentheses
X^2-X^2+8X-12X+36-12=0
We add all the numbers together, and all the variables
-4X+24=0
We move all terms containing X to the left, all other terms to the right
-4X=-24
X=-24/-4
X=+6
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