21-4k=9

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Solution for 21-4k=9 equation: 



21-4k=9

We move all terms to the left:

21-4k-(9)=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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