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2+13=2x-12+7x
We move all terms to the left:
2+13-(2x-12+7x)=0
We add all the numbers together, and all the variables
-(9x-12)+2+13=0
We add all the numbers together, and all the variables
-(9x-12)+15=0
We get rid of parentheses
-9x+12+15=0
We add all the numbers together, and all the variables
-9x+27=0
We move all terms containing x to the left, all other terms to the right
-9x=-27
x=-27/-9
x=+3
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