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X+18=2X+6
We move all terms to the left:
X+18-(2X+6)=0
We get rid of parentheses
X-2X-6+18=0
We add all the numbers together, and all the variables
-1X+12=0
We move all terms containing X to the left, all other terms to the right
-X=-12
X=-12/-1
X=+12
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