-21=5n-8n

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Solution for -21=5n-8n equation: 



-21=5n-8n

We move all terms to the left:

-21-(5n-8n)=0

We add all the numbers together, and all the variables

-(-3n)-21=0

We get rid of parentheses

3n-21=0

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

3n=21

n=21/3

n=7

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