21=3(n+1)

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Solution for 21=3(n+1) equation: 



21=3(n+1)

We move all terms to the left:

21-(3(n+1))=0



We calculate terms in parentheses: -(3(n+1)), so:

3(n+1)

We multiply parentheses

3n+3

Back to the equation:

-(3n+3)



We get rid of parentheses

-3n-3+21=0

We add all the numbers together, and all the variables

-3n+18=0

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

-3n=-18

n=-18/-3

n=+6

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