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x+12=2x-15
We move all terms to the left:
x+12-(2x-15)=0
We get rid of parentheses
x-2x+15+12=0
We add all the numbers together, and all the variables
-1x+27=0
We move all terms containing x to the left, all other terms to the right
-x=-27
x=-27/-1
x=+27
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