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(x+30)+(2x+10)=180
We move all terms to the left:
(x+30)+(2x+10)-(180)=0
We get rid of parentheses
x+2x+30+10-180=0
We add all the numbers together, and all the variables
3x-140=0
We move all terms containing x to the left, all other terms to the right
3x=140
x=140/3
x=46+2/3
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