-21=3(-7+n)

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Solution for -21=3(-7+n) equation: 



-21=3(-7+n)

We move all terms to the left:

-21-(3(-7+n))=0

We add all the numbers together, and all the variables

-(3(n-7))-21=0



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

3(n-7)

We multiply parentheses

3n-21

Back to the equation:

-(3n-21)



We get rid of parentheses

-3n+21-21=0

We add all the numbers together, and all the variables

-3n=0

n=0/-3

n=0

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