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6n-3=4n+21
We move all terms to the left:
6n-3-(4n+21)=0
We get rid of parentheses
6n-4n-21-3=0
We add all the numbers together, and all the variables
2n-24=0
We move all terms containing n to the left, all other terms to the right
2n=24
n=24/2
n=12
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