99=4r+5r

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Solution for 99=4r+5r equation: 



99=4r+5r

We move all terms to the left:

99-(4r+5r)=0

We add all the numbers together, and all the variables

-(+9r)+99=0

We get rid of parentheses

-9r+99=0

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

-9r=-99

r=-99/-9

r=+11

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