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(3x-9)+90+60=180
We move all terms to the left:
(3x-9)+90+60-(180)=0
We add all the numbers together, and all the variables
(3x-9)-30=0
We get rid of parentheses
3x-9-30=0
We add all the numbers together, and all the variables
3x-39=0
We move all terms containing x to the left, all other terms to the right
3x=39
x=39/3
x=13
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