-12=0.4k

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Solution for -12=0.4k equation: 



-12=0.4k

We move all terms to the left:

-12-(0.4k)=0

We add all the numbers together, and all the variables

-(+0.4k)-12=0

We get rid of parentheses

-0.4k-12=0

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

-0.4k=12

k=12/-0.4

k=-30

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