21=9-21k

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Solution for 21=9-21k equation: 



21=9-21k

We move all terms to the left:

21-(9-21k)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

21k-9+21=0

We add all the numbers together, and all the variables

21k+12=0

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

21k=-12

k=-12/21

k=-4/7

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