3.9r=-17.55

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Solution for 3.9r=-17.55 equation: 



3.9r=-17.55

We move all terms to the left:

3.9r-(-17.55)=0

We add all the numbers together, and all the variables

3.9r+17.55=0

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

3.9r=-17.55

r=-17.55/3.9

r=-4+1/2

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