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2x+(x+12)+(x-16)=180
We move all terms to the left:
2x+(x+12)+(x-16)-(180)=0
We get rid of parentheses
2x+x+x+12-16-180=0
We add all the numbers together, and all the variables
4x-184=0
We move all terms containing x to the left, all other terms to the right
4x=184
x=184/4
x=46
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