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(12x+12)+(5x+15)=180
We move all terms to the left:
(12x+12)+(5x+15)-(180)=0
We get rid of parentheses
12x+5x+12+15-180=0
We add all the numbers together, and all the variables
17x-153=0
We move all terms containing x to the left, all other terms to the right
17x=153
x=153/17
x=9
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