18=9k-3k

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Solution for 18=9k-3k equation: 



18=9k-3k

We move all terms to the left:

18-(9k-3k)=0

We add all the numbers together, and all the variables

-(+6k)+18=0

We get rid of parentheses

-6k+18=0

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

-6k=-18

k=-18/-6

k=+3

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