9=21-4n

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Solution for 9=21-4n equation: 



9=21-4n

We move all terms to the left:

9-(21-4n)=0

We add all the numbers together, and all the variables

-(-4n+21)+9=0

We get rid of parentheses

4n-21+9=0

We add all the numbers together, and all the variables

4n-12=0

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

4n=12

n=12/4

n=3

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