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(7x+12)+(2x+13)+(2x+12)=180
We move all terms to the left:
(7x+12)+(2x+13)+(2x+12)-(180)=0
We get rid of parentheses
7x+2x+2x+12+13+12-180=0
We add all the numbers together, and all the variables
11x-143=0
We move all terms containing x to the left, all other terms to the right
11x=143
x=143/11
x=13
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