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24x-84=12x+36
We move all terms to the left:
24x-84-(12x+36)=0
We get rid of parentheses
24x-12x-36-84=0
We add all the numbers together, and all the variables
12x-120=0
We move all terms containing x to the left, all other terms to the right
12x=120
x=120/12
x=10
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