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-12-2x=x+15
We move all terms to the left:
-12-2x-(x+15)=0
We get rid of parentheses
-2x-x-15-12=0
We add all the numbers together, and all the variables
-3x-27=0
We move all terms containing x to the left, all other terms to the right
-3x=27
x=27/-3
x=-9
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