-13r-10r=-15

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Solution for -13r-10r=-15 equation: 



-13r-10r=-15

We move all terms to the left:

-13r-10r-(-15)=0

We add all the numbers together, and all the variables

-23r+15=0

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

-23r=-15

r=-15/-23

r=15/23

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