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(4x+12)+(80-x)=180
We move all terms to the left:
(4x+12)+(80-x)-(180)=0
We add all the numbers together, and all the variables
(4x+12)+(-1x+80)-180=0
We get rid of parentheses
4x-1x+12+80-180=0
We add all the numbers together, and all the variables
3x-88=0
We move all terms containing x to the left, all other terms to the right
3x=88
x=88/3
x=29+1/3
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