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(6x+6)+(5x+15)+(7x-3)=180
We move all terms to the left:
(6x+6)+(5x+15)+(7x-3)-(180)=0
We get rid of parentheses
6x+5x+7x+6+15-3-180=0
We add all the numbers together, and all the variables
18x-162=0
We move all terms containing x to the left, all other terms to the right
18x=162
x=162/18
x=9
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