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(3x-1)+(2x+9)=180
We move all terms to the left:
(3x-1)+(2x+9)-(180)=0
We get rid of parentheses
3x+2x-1+9-180=0
We add all the numbers together, and all the variables
5x-172=0
We move all terms containing x to the left, all other terms to the right
5x=172
x=172/5
x=34+2/5
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