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(13x+15)+(9x+5)+(9x+5)=180
We move all terms to the left:
(13x+15)+(9x+5)+(9x+5)-(180)=0
We get rid of parentheses
13x+9x+9x+15+5+5-180=0
We add all the numbers together, and all the variables
31x-155=0
We move all terms containing x to the left, all other terms to the right
31x=155
x=155/31
x=5
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