-28=0.4k

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Solution for -28=0.4k equation: 



-28=0.4k

We move all terms to the left:

-28-(0.4k)=0

We add all the numbers together, and all the variables

-(+0.4k)-28=0

We get rid of parentheses

-0.4k-28=0

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

-0.4k=28

k=28/-0.4

k=-70

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