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x+(x+40)+(x+80)=180
We move all terms to the left:
x+(x+40)+(x+80)-(180)=0
We get rid of parentheses
x+x+x+40+80-180=0
We add all the numbers together, and all the variables
3x-60=0
We move all terms containing x to the left, all other terms to the right
3x=60
x=60/3
x=20
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