13=r/9+18

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Solution for 13=r/9+18 equation: 



13=r/9+18

We move all terms to the left:

13-(r/9+18)=0

We get rid of parentheses

-r/9-18+13=0

We multiply all the terms by the denominator


-r-18*9+13*9=0

We add all the numbers together, and all the variables

-1r-45=0

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

-r=45

r=45/-1

r=-45

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