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8n+3=21+2n
We move all terms to the left:
8n+3-(21+2n)=0
We add all the numbers together, and all the variables
8n-(2n+21)+3=0
We get rid of parentheses
8n-2n-21+3=0
We add all the numbers together, and all the variables
6n-18=0
We move all terms containing n to the left, all other terms to the right
6n=18
n=18/6
n=3
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