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X+(X+12)=74
We move all terms to the left:
X+(X+12)-(74)=0
We get rid of parentheses
X+X+12-74=0
We add all the numbers together, and all the variables
2X-62=0
We move all terms containing X to the left, all other terms to the right
2X=62
X=62/2
X=31
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