18=9+3k

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Solution for 18=9+3k equation: 



18=9+3k

We move all terms to the left:

18-(9+3k)=0

We add all the numbers together, and all the variables

-(3k+9)+18=0

We get rid of parentheses

-3k-9+18=0

We add all the numbers together, and all the variables

-3k+9=0

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

-3k=-9

k=-9/-3

k=+3

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