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12+(2x+12)=180
We move all terms to the left:
12+(2x+12)-(180)=0
We add all the numbers together, and all the variables
(2x+12)-168=0
We get rid of parentheses
2x+12-168=0
We add all the numbers together, and all the variables
2x-156=0
We move all terms containing x to the left, all other terms to the right
2x=156
x=156/2
x=78
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