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(x+84)+(2x)=180
We move all terms to the left:
(x+84)+(2x)-(180)=0
We add all the numbers together, and all the variables
2x+(x+84)-180=0
We get rid of parentheses
2x+x+84-180=0
We add all the numbers together, and all the variables
3x-96=0
We move all terms containing x to the left, all other terms to the right
3x=96
x=96/3
x=32
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