13=r/2+9

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Solution for 13=r/2+9 equation: 



13=r/2+9

We move all terms to the left:

13-(r/2+9)=0

We get rid of parentheses

-r/2-9+13=0

We multiply all the terms by the denominator


-r-9*2+13*2=0

We add all the numbers together, and all the variables

-1r+8=0

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

-r=-8

r=-8/-1

r=+8

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