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X+(X-15)=345
We move all terms to the left:
X+(X-15)-(345)=0
We get rid of parentheses
X+X-15-345=0
We add all the numbers together, and all the variables
2X-360=0
We move all terms containing X to the left, all other terms to the right
2X=360
X=360/2
X=180
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