15=-12.75r

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Solution for 15=-12.75r equation: 



15=-12.75r

We move all terms to the left:

15-(-12.75r)=0

We get rid of parentheses

12.75r+15=0

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

12.75r=-15

r=-15/12.75

r=-1+1/5.66666666667

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