-81=-3(7n-1)

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Solution for -81=-3(7n-1) equation: 



-81=-3(7n-1)

We move all terms to the left:

-81-(-3(7n-1))=0



We calculate terms in parentheses: -(-3(7n-1)), so:

-3(7n-1)

We multiply parentheses

-21n+3

Back to the equation:

-(-21n+3)



We get rid of parentheses

21n-3-81=0

We add all the numbers together, and all the variables

21n-84=0

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

21n=84

n=84/21

n=4

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