-81=3(k-7)+7k

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



-81=3(k-7)+7k

We move all terms to the left:

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



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

3(k-7)+7k

We add all the numbers together, and all the variables

7k+3(k-7)

We multiply parentheses

7k+3k-21

We add all the numbers together, and all the variables

10k-21

Back to the equation:

-(10k-21)



We get rid of parentheses

-10k+21-81=0

We add all the numbers together, and all the variables

-10k-60=0

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

-10k=60

k=60/-10

k=-6

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