21-3n=84

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Solution for 21-3n=84 equation: 



21-3n=84

We move all terms to the left:

21-3n-(84)=0

We add all the numbers together, and all the variables

-3n-63=0

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

-3n=63

n=63/-3

n=-21

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