-18=k+8k

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Solution for -18=k+8k equation: 



-18=k+8k

We move all terms to the left:

-18-(k+8k)=0

We add all the numbers together, and all the variables

-(+9k)-18=0

We get rid of parentheses

-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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