9-3k=-21

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Solution for 9-3k=-21 equation: 



9-3k=-21

We move all terms to the left:

9-3k-(-21)=0

We add all the numbers together, and all the variables

-3k+30=0

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

-3k=-30

k=-30/-3

k=+10

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