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X+(X+1)=269
We move all terms to the left:
X+(X+1)-(269)=0
We get rid of parentheses
X+X+1-269=0
We add all the numbers together, and all the variables
2X-268=0
We move all terms containing X to the left, all other terms to the right
2X=268
X=268/2
X=134
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