99=13r-31

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Solution for 99=13r-31 equation: 



99=13r-31

We move all terms to the left:

99-(13r-31)=0

We get rid of parentheses

-13r+31+99=0

We add all the numbers together, and all the variables

-13r+130=0

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

-13r=-130

r=-130/-13

r=+10

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