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(x+12)+x=180
We move all terms to the left:
(x+12)+x-(180)=0
We add all the numbers together, and all the variables
x+(x+12)-180=0
We get rid of parentheses
x+x+12-180=0
We add all the numbers together, and all the variables
2x-168=0
We move all terms containing x to the left, all other terms to the right
2x=168
x=168/2
x=84
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