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(x+20)+(2x-40)+(2x-20)=180
We move all terms to the left:
(x+20)+(2x-40)+(2x-20)-(180)=0
We get rid of parentheses
x+2x+2x+20-40-20-180=0
We add all the numbers together, and all the variables
5x-220=0
We move all terms containing x to the left, all other terms to the right
5x=220
x=220/5
x=44
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