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(x+12)+3x=180
We move all terms to the left:
(x+12)+3x-(180)=0
We add all the numbers together, and all the variables
3x+(x+12)-180=0
We get rid of parentheses
3x+x+12-180=0
We add all the numbers together, and all the variables
4x-168=0
We move all terms containing x to the left, all other terms to the right
4x=168
x=168/4
x=42
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