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(3x+60)+(2x-30)=170
We move all terms to the left:
(3x+60)+(2x-30)-(170)=0
We get rid of parentheses
3x+2x+60-30-170=0
We add all the numbers together, and all the variables
5x-140=0
We move all terms containing x to the left, all other terms to the right
5x=140
x=140/5
x=28
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