2n+3=21=n

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Solution for 2n+3=21=n equation: 



2n+3=21=n

We move all terms to the left:

2n+3-(21)=0

We add all the numbers together, and all the variables

2n-18=0

We move all terms containing n to the left, all other terms to the right

2n=18

n=18/2

n=9

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