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X+(X+3)+(X+5)=249
We move all terms to the left:
X+(X+3)+(X+5)-(249)=0
We get rid of parentheses
X+X+X+3+5-249=0
We add all the numbers together, and all the variables
3X-241=0
We move all terms containing X to the left, all other terms to the right
3X=241
X=241/3
X=80+1/3
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