12=r*(0.4)

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Solution for 12=r*(0.4) equation: 



12=r(0.4)

We move all terms to the left:

12-(r(0.4))=0



We calculate terms in parentheses: -(r(0.4)), so:

r(0.4)

We multiply parentheses

0.4r

Back to the equation:

-(0.4r)



We add all the numbers together, and all the variables

-(+0.4r)+12=0

We get rid of parentheses

-0.4r+12=0

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

-0.4r=-12

r=-12/-0.4

r=+30

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