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3x-9=15+2x
We move all terms to the left:
3x-9-(15+2x)=0
We add all the numbers together, and all the variables
3x-(2x+15)-9=0
We get rid of parentheses
3x-2x-15-9=0
We add all the numbers together, and all the variables
x-24=0
We move all terms containing x to the left, all other terms to the right
x=24
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