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7x-84=3x+24
We move all terms to the left:
7x-84-(3x+24)=0
We get rid of parentheses
7x-3x-24-84=0
We add all the numbers together, and all the variables
4x-108=0
We move all terms containing x to the left, all other terms to the right
4x=108
x=108/4
x=27
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