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 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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