12=3k+9k

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Solution for 12=3k+9k equation: 



12=3k+9k

We move all terms to the left:

12-(3k+9k)=0

We add all the numbers together, and all the variables

-(+12k)+12=0

We get rid of parentheses

-12k+12=0

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

-12k=-12

k=-12/-12

k=1

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