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X+2X+(2X-13)=102
We move all terms to the left:
X+2X+(2X-13)-(102)=0
We add all the numbers together, and all the variables
3X+(2X-13)-102=0
We get rid of parentheses
3X+2X-13-102=0
We add all the numbers together, and all the variables
5X-115=0
We move all terms containing X to the left, all other terms to the right
5X=115
X=115/5
X=23
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