12-3n=21

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Solution for 12-3n=21 equation: 



12-3n=21

We move all terms to the left:

12-3n-(21)=0

We add all the numbers together, and all the variables

-3n-9=0

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

-3n=9

n=9/-3

n=-3

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