9=-1+r/2

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Solution for 9=-1+r/2 equation: 



9=-1+r/2

We move all terms to the left:

9-(-1+r/2)=0

We add all the numbers together, and all the variables

-(r/2-1)+9=0

We get rid of parentheses

-r/2+1+9=0

We multiply all the terms by the denominator


-r+1*2+9*2=0

We add all the numbers together, and all the variables

-1r+20=0

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

-r=-20

r=-20/-1

r=+20

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