21=9+4k

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Solution for 21=9+4k equation: 



21=9+4k

We move all terms to the left:

21-(9+4k)=0

We add all the numbers together, and all the variables

-(4k+9)+21=0

We get rid of parentheses

-4k-9+21=0

We add all the numbers together, and all the variables

-4k+12=0

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

-4k=-12

k=-12/-4

k=+3

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