15=0.4r

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Solution for 15=0.4r equation: 



15=0.4r

We move all terms to the left:

15-(0.4r)=0

We add all the numbers together, and all the variables

-(+0.4r)+15=0

We get rid of parentheses

-0.4r+15=0

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

-0.4r=-15

r=-15/-0.4

r=37+0.2/0.4

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