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8x-3x-15=2x+12
We move all terms to the left:
8x-3x-15-(2x+12)=0
We add all the numbers together, and all the variables
5x-(2x+12)-15=0
We get rid of parentheses
5x-2x-12-15=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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