15=3.9r

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Solution for 15=3.9r equation: 



15=3.9r

We move all terms to the left:

15-(3.9r)=0

We add all the numbers together, and all the variables

-(+3.9r)+15=0

We get rid of parentheses

-3.9r+15=0

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

-3.9r=-15

r=-15/-3.9

r=3+1/1.1818181818182

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