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X+(X+2)+(X+4)=249
We move all terms to the left:
X+(X+2)+(X+4)-(249)=0
We get rid of parentheses
X+X+X+2+4-249=0
We add all the numbers together, and all the variables
3X-243=0
We move all terms containing X to the left, all other terms to the right
3X=243
X=243/3
X=81
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