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(6x+15)+(7x-6)=180
We move all terms to the left:
(6x+15)+(7x-6)-(180)=0
We get rid of parentheses
6x+7x+15-6-180=0
We add all the numbers together, and all the variables
13x-171=0
We move all terms containing x to the left, all other terms to the right
13x=171
x=171/13
x=13+2/13
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