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(2x+10)+(2x+50)+(x+40)=180
We move all terms to the left:
(2x+10)+(2x+50)+(x+40)-(180)=0
We get rid of parentheses
2x+2x+x+10+50+40-180=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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