1=13+r/9

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Solution for 1=13+r/9 equation: 



1=13+r/9

We move all terms to the left:

1-(13+r/9)=0

We add all the numbers together, and all the variables

-(r/9+13)+1=0

We get rid of parentheses

-r/9-13+1=0

We multiply all the terms by the denominator


-r-13*9+1*9=0

We add all the numbers together, and all the variables

-1r-108=0

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

-r=108

r=108/-1

r=-108

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