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15x=84+12x
We move all terms to the left:
15x-(84+12x)=0
We add all the numbers together, and all the variables
15x-(12x+84)=0
We get rid of parentheses
15x-12x-84=0
We add all the numbers together, and all the variables
3x-84=0
We move all terms containing x to the left, all other terms to the right
3x=84
x=84/3
x=28
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