9=2r-1

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Solution for 9=2r-1 equation: 



9=2r-1

We move all terms to the left:

9-(2r-1)=0

We get rid of parentheses

-2r+1+9=0

We add all the numbers together, and all the variables

-2r+10=0

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

-2r=-10

r=-10/-2

r=+5

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