13k-4k=18

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Solution for 13k-4k=18 equation: 



13k-4k=18

We move all terms to the left:

13k-4k-(18)=0

We add all the numbers together, and all the variables

9k-18=0

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

9k=18

k=18/9

k=2

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