9r-57=15r-99

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Solution for 9r-57=15r-99 equation: 



9r-57=15r-99

We move all terms to the left:

9r-57-(15r-99)=0

We get rid of parentheses

9r-15r+99-57=0

We add all the numbers together, and all the variables

-6r+42=0

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

-6r=-42

r=-42/-6

r=+7

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