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X+(2X-15)=345
We move all terms to the left:
X+(2X-15)-(345)=0
We get rid of parentheses
X+2X-15-345=0
We add all the numbers together, and all the variables
3X-360=0
We move all terms containing X to the left, all other terms to the right
3X=360
X=360/3
X=120
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