-81=39(1+7k)

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Solution for -81=39(1+7k) equation: 



-81=39(1+7k)

We move all terms to the left:

-81-(39(1+7k))=0

We add all the numbers together, and all the variables

-(39(7k+1))-81=0



We calculate terms in parentheses: -(39(7k+1)), so:

39(7k+1)

We multiply parentheses

273k+39

Back to the equation:

-(273k+39)



We get rid of parentheses

-273k-39-81=0

We add all the numbers together, and all the variables

-273k-120=0

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

-273k=120

k=120/-273

k=-40/91

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