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(3x-30)=80
We move all terms to the left:
(3x-30)-(80)=0
We get rid of parentheses
3x-30-80=0
We add all the numbers together, and all the variables
3x-110=0
We move all terms containing x to the left, all other terms to the right
3x=110
x=110/3
x=36+2/3
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