13r-r+3r-13r+7r-2=25

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Solution for 13r-r+3r-13r+7r-2=25 equation: 



13r-r+3r-13r+7r-2=25

We move all terms to the left:

13r-r+3r-13r+7r-2-(25)=0

We add all the numbers together, and all the variables

9r-27=0

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

9r=27

r=27/9

r=3

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