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42x-84=6x+24
We move all terms to the left:
42x-84-(6x+24)=0
We get rid of parentheses
42x-6x-24-84=0
We add all the numbers together, and all the variables
36x-108=0
We move all terms containing x to the left, all other terms to the right
36x=108
x=108/36
x=3
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