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4x-12+2x=3x+15
We move all terms to the left:
4x-12+2x-(3x+15)=0
We add all the numbers together, and all the variables
6x-(3x+15)-12=0
We get rid of parentheses
6x-3x-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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