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(x+20)+80=180
We move all terms to the left:
(x+20)+80-(180)=0
We add all the numbers together, and all the variables
(x+20)-100=0
We get rid of parentheses
x+20-100=0
We add all the numbers together, and all the variables
x-80=0
We move all terms containing x to the left, all other terms to the right
x=80
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