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X+54=2X+18
We move all terms to the left:
X+54-(2X+18)=0
We get rid of parentheses
X-2X-18+54=0
We add all the numbers together, and all the variables
-1X+36=0
We move all terms containing X to the left, all other terms to the right
-X=-36
X=-36/-1
X=+36
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