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X+(18+X)=60
We move all terms to the left:
X+(18+X)-(60)=0
We add all the numbers together, and all the variables
X+(X+18)-60=0
We get rid of parentheses
X+X+18-60=0
We add all the numbers together, and all the variables
2X-42=0
We move all terms containing X to the left, all other terms to the right
2X=42
X=42/2
X=21
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