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(3x+30)+(3x-10)=180
We move all terms to the left:
(3x+30)+(3x-10)-(180)=0
We get rid of parentheses
3x+3x+30-10-180=0
We add all the numbers together, and all the variables
6x-160=0
We move all terms containing x to the left, all other terms to the right
6x=160
x=160/6
x=26+2/3
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