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(3x+84)+(x+18)+(2x-4)=180
We move all terms to the left:
(3x+84)+(x+18)+(2x-4)-(180)=0
We get rid of parentheses
3x+x+2x+84+18-4-180=0
We add all the numbers together, and all the variables
6x-82=0
We move all terms containing x to the left, all other terms to the right
6x=82
x=82/6
x=13+2/3
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