21-8k=-1-7(5k-7)

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Solution for 21-8k=-1-7(5k-7) equation: 



21-8k=-1-7(5k-7)

We move all terms to the left:

21-8k-(-1-7(5k-7))=0



We calculate terms in parentheses: -(-1-7(5k-7)), so:

-1-7(5k-7)

determiningTheFunctionDomain
-7(5k-7)-1

We multiply parentheses

-35k+49-1

We add all the numbers together, and all the variables

-35k+48

Back to the equation:

-(-35k+48)



We get rid of parentheses

-8k+35k-48+21=0

We add all the numbers together, and all the variables

27k-27=0

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

27k=27

k=27/27

k=1

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