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-12+9x=15+8x
We move all terms to the left:
-12+9x-(15+8x)=0
We add all the numbers together, and all the variables
9x-(8x+15)-12=0
We get rid of parentheses
9x-8x-15-12=0
We add all the numbers together, and all the variables
x-27=0
We move all terms containing x to the left, all other terms to the right
x=27
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