8k-12=k+9

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Solution for 8k-12=k+9 equation: 



8k-12=k+9

We move all terms to the left:

8k-12-(k+9)=0

We get rid of parentheses

8k-k-9-12=0

We add all the numbers together, and all the variables

7k-21=0

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

7k=21

k=21/7

k=3

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