9=12-3k

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Solution for 9=12-3k equation: 



9=12-3k

We move all terms to the left:

9-(12-3k)=0

We add all the numbers together, and all the variables

-(-3k+12)+9=0

We get rid of parentheses

3k-12+9=0

We add all the numbers together, and all the variables

3k-3=0

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

3k=3

k=3/3

k=1

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