9-3n=21

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Solution for 9-3n=21 equation: 



9-3n=21

We move all terms to the left:

9-3n-(21)=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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