21=3(8+n)

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Solution for 21=3(8+n) equation: 



21=3(8+n)

We move all terms to the left:

21-(3(8+n))=0

We add all the numbers together, and all the variables

-(3(n+8))+21=0



We calculate terms in parentheses: -(3(n+8)), so:

3(n+8)

We multiply parentheses

3n+24

Back to the equation:

-(3n+24)



We get rid of parentheses

-3n-24+21=0

We add all the numbers together, and all the variables

-3n-3=0

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

-3n=3

n=3/-3

n=-1

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