-8=-0.4k

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Solution for -8=-0.4k equation: 



-8=-0.4k

We move all terms to the left:

-8-(-0.4k)=0

We get rid of parentheses

0.4k-8=0

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

0.4k=8

k=8/0.4

k=20

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