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X+(X+10)+(X+20)=60
We move all terms to the left:
X+(X+10)+(X+20)-(60)=0
We get rid of parentheses
X+X+X+10+20-60=0
We add all the numbers together, and all the variables
3X-30=0
We move all terms containing X to the left, all other terms to the right
3X=30
X=30/3
X=10
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