84=-3(-7-3n)

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Solution for 84=-3(-7-3n) equation: 



84=-3(-7-3n)

We move all terms to the left:

84-(-3(-7-3n))=0

We add all the numbers together, and all the variables

-(-3(-3n-7))+84=0



We calculate terms in parentheses: -(-3(-3n-7)), so:

-3(-3n-7)

We multiply parentheses

9n+21

Back to the equation:

-(9n+21)



We get rid of parentheses

-9n-21+84=0

We add all the numbers together, and all the variables

-9n+63=0

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

-9n=-63

n=-63/-9

n=+7

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