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(2x-80)+(x+50)=180
We move all terms to the left:
(2x-80)+(x+50)-(180)=0
We get rid of parentheses
2x+x-80+50-180=0
We add all the numbers together, and all the variables
3x-210=0
We move all terms containing x to the left, all other terms to the right
3x=210
x=210/3
x=70
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