21=n+6n

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Solution for 21=n+6n equation: 



21=n+6n

We move all terms to the left:

21-(n+6n)=0

We add all the numbers together, and all the variables

-(+7n)+21=0

We get rid of parentheses

-7n+21=0

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

-7n=-21

n=-21/-7

n=+3

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