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X+(X+1)+(X+2)=495
We move all terms to the left:
X+(X+1)+(X+2)-(495)=0
We get rid of parentheses
X+X+X+1+2-495=0
We add all the numbers together, and all the variables
3X-492=0
We move all terms containing X to the left, all other terms to the right
3X=492
X=492/3
X=164
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