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(2x+30)+(3x-10)=80
We move all terms to the left:
(2x+30)+(3x-10)-(80)=0
We get rid of parentheses
2x+3x+30-10-80=0
We add all the numbers together, and all the variables
5x-60=0
We move all terms containing x to the left, all other terms to the right
5x=60
x=60/5
x=12
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