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(3x-20)+(2x+50)=180
We move all terms to the left:
(3x-20)+(2x+50)-(180)=0
We get rid of parentheses
3x+2x-20+50-180=0
We add all the numbers together, and all the variables
5x-150=0
We move all terms containing x to the left, all other terms to the right
5x=150
x=150/5
x=30
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