99r-77=10r-8

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Solution for 99r-77=10r-8 equation: 



99r-77=10r-8

We move all terms to the left:

99r-77-(10r-8)=0

We get rid of parentheses

99r-10r+8-77=0

We add all the numbers together, and all the variables

89r-69=0

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

89r=69

r=69/89

r=69/89

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