-21=-3(k+9)

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Solution for -21=-3(k+9) equation: 



-21=-3(k+9)

We move all terms to the left:

-21-(-3(k+9))=0



We calculate terms in parentheses: -(-3(k+9)), so:

-3(k+9)

We multiply parentheses

-3k-27

Back to the equation:

-(-3k-27)



We get rid of parentheses

3k+27-21=0

We add all the numbers together, and all the variables

3k+6=0

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

3k=-6

k=-6/3

k=-2

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