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(x+20)+(x+10)+(90)=180
We move all terms to the left:
(x+20)+(x+10)+(90)-(180)=0
We add all the numbers together, and all the variables
(x+20)+(x+10)-90=0
We get rid of parentheses
x+x+20+10-90=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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