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(x+12)+(x+12)+x=180
We move all terms to the left:
(x+12)+(x+12)+x-(180)=0
We add all the numbers together, and all the variables
x+(x+12)+(x+12)-180=0
We get rid of parentheses
x+x+x+12+12-180=0
We add all the numbers together, and all the variables
3x-156=0
We move all terms containing x to the left, all other terms to the right
3x=156
x=156/3
x=52
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