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x+(x+120)=180
We move all terms to the left:
x+(x+120)-(180)=0
We get rid of parentheses
x+x+120-180=0
We add all the numbers together, and all the variables
2x-60=0
We move all terms containing x to the left, all other terms to the right
2x=60
x=60/2
x=30
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