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(2x+30)+(2x+20)+x+50=180
We move all terms to the left:
(2x+30)+(2x+20)+x+50-(180)=0
We add all the numbers together, and all the variables
x+(2x+30)+(2x+20)-130=0
We get rid of parentheses
x+2x+2x+30+20-130=0
We add all the numbers together, and all the variables
5x-80=0
We move all terms containing x to the left, all other terms to the right
5x=80
x=80/5
x=16
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