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x+12+(x+x)=180
We move all terms to the left:
x+12+(x+x)-(180)=0
We add all the numbers together, and all the variables
x+(+2x)+12-180=0
We add all the numbers together, and all the variables
x+(+2x)-168=0
We get rid of parentheses
x+2x-168=0
We add all the numbers together, and all the variables
3x-168=0
We move all terms containing x to the left, all other terms to the right
3x=168
x=168/3
x=56
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