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X+(2X+25)=131
We move all terms to the left:
X+(2X+25)-(131)=0
We get rid of parentheses
X+2X+25-131=0
We add all the numbers together, and all the variables
3X-106=0
We move all terms containing X to the left, all other terms to the right
3X=106
X=106/3
X=35+1/3
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