12=-9+3n

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Solution for 12=-9+3n equation: 



12=-9+3n

We move all terms to the left:

12-(-9+3n)=0

We add all the numbers together, and all the variables

-(3n-9)+12=0

We get rid of parentheses

-3n+9+12=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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