13k-9k=12

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Solution for 13k-9k=12 equation: 



13k-9k=12

We move all terms to the left:

13k-9k-(12)=0

We add all the numbers together, and all the variables

4k-12=0

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

4k=12

k=12/4

k=3

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