9=21-3n

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Solution for 9=21-3n equation: 



9=21-3n

We move all terms to the left:

9-(21-3n)=0

We add all the numbers together, and all the variables

-(-3n+21)+9=0

We get rid of parentheses

3n-21+9=0

We add all the numbers together, and all the variables

3n-12=0

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

3n=12

n=12/3

n=4

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