9=3k-12

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Solution for 9=3k-12 equation: 



9=3k-12

We move all terms to the left:

9-(3k-12)=0

We get rid of parentheses

-3k+12+9=0

We add all the numbers together, and all the variables

-3k+21=0

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

-3k=-21

k=-21/-3

k=+7

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