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X+3=2X-15
We move all terms to the left:
X+3-(2X-15)=0
We get rid of parentheses
X-2X+15+3=0
We add all the numbers together, and all the variables
-1X+18=0
We move all terms containing X to the left, all other terms to the right
-X=-18
X=-18/-1
X=+18
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