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(x+20)+x+90=180
We move all terms to the left:
(x+20)+x+90-(180)=0
We add all the numbers together, and all the variables
x+(x+20)-90=0
We get rid of parentheses
x+x+20-90=0
We add all the numbers together, and all the variables
2x-70=0
We move all terms containing x to the left, all other terms to the right
2x=70
x=70/2
x=35
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