21=n-8n

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Solution for 21=n-8n equation: 



21=n-8n

We move all terms to the left:

21-(n-8n)=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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