99=10r+19

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Solution for 99=10r+19 equation: 



99=10r+19

We move all terms to the left:

99-(10r+19)=0

We get rid of parentheses

-10r-19+99=0

We add all the numbers together, and all the variables

-10r+80=0

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

-10r=-80

r=-80/-10

r=+8

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