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5n-3=2n+21
We move all terms to the left:
5n-3-(2n+21)=0
We get rid of parentheses
5n-2n-21-3=0
We add all the numbers together, and all the variables
3n-24=0
We move all terms containing n to the left, all other terms to the right
3n=24
n=24/3
n=8
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