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X+(X+1)+(X+2)=264
We move all terms to the left:
X+(X+1)+(X+2)-(264)=0
We get rid of parentheses
X+X+X+1+2-264=0
We add all the numbers together, and all the variables
3X-261=0
We move all terms containing X to the left, all other terms to the right
3X=261
X=261/3
X=87
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