12=0.4k+18

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Solution for 12=0.4k+18 equation: 



12=0.4k+18

We move all terms to the left:

12-(0.4k+18)=0

We get rid of parentheses

-0.4k-18+12=0

We add all the numbers together, and all the variables

-0.4k-6=0

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

-0.4k=6

k=6/-0.4

k=-15

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