9=3n-12

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Solution for 9=3n-12 equation: 



9=3n-12

We move all terms to the left:

9-(3n-12)=0

We get rid of parentheses

-3n+12+9=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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