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9x-(x+3)=2x+15
We move all terms to the left:
9x-(x+3)-(2x+15)=0
We get rid of parentheses
9x-x-2x-3-15=0
We add all the numbers together, and all the variables
6x-18=0
We move all terms containing x to the left, all other terms to the right
6x=18
x=18/6
x=3
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