n=4n-21

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Solution for n=4n-21 equation: 



n=4n-21

We move all terms to the left:

n-(4n-21)=0

We get rid of parentheses

n-4n+21=0

We add all the numbers together, and all the variables

-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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