-81=-3(7k-1)

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



-81=-3(7k-1)

We move all terms to the left:

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



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

-3(7k-1)

We multiply parentheses

-21k+3

Back to the equation:

-(-21k+3)



We get rid of parentheses

21k-3-81=0

We add all the numbers together, and all the variables

21k-84=0

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

21k=84

k=84/21

k=4

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