-15.9=-3.9r

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Solution for -15.9=-3.9r equation: 



-15.9=-3.9r

We move all terms to the left:

-15.9-(-3.9r)=0

We get rid of parentheses

3.9r-15.9=0

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

3.9r=15.9

r=15.9/3.9

r=4+0.3/3.9

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