21=7(8k-9)

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Solution for 21=7(8k-9) equation: 



21=7(8k-9)

We move all terms to the left:

21-(7(8k-9))=0



We calculate terms in parentheses: -(7(8k-9)), so:

7(8k-9)

We multiply parentheses

56k-63

Back to the equation:

-(56k-63)



We get rid of parentheses

-56k+63+21=0

We add all the numbers together, and all the variables

-56k+84=0

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

-56k=-84

k=-84/-56

k=1+1/2

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