13r-7r+3r=81

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Solution for 13r-7r+3r=81 equation: 



13r-7r+3r=81

We move all terms to the left:

13r-7r+3r-(81)=0

We add all the numbers together, and all the variables

9r-81=0

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

9r=81

r=81/9

r=9

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