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(x+84)+(3x)=180
We move all terms to the left:
(x+84)+(3x)-(180)=0
We add all the numbers together, and all the variables
3x+(x+84)-180=0
We get rid of parentheses
3x+x+84-180=0
We add all the numbers together, and all the variables
4x-96=0
We move all terms containing x to the left, all other terms to the right
4x=96
x=96/4
x=24
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