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(x+20)+70=180
We move all terms to the left:
(x+20)+70-(180)=0
We add all the numbers together, and all the variables
(x+20)-110=0
We get rid of parentheses
x+20-110=0
We add all the numbers together, and all the variables
x-90=0
We move all terms containing x to the left, all other terms to the right
x=90
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