2=9+r/13

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Solution for 2=9+r/13 equation: 



2=9+r/13

We move all terms to the left:

2-(9+r/13)=0

We add all the numbers together, and all the variables

-(r/13+9)+2=0

We get rid of parentheses

-r/13-9+2=0

We multiply all the terms by the denominator


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

We add all the numbers together, and all the variables

-1r-91=0

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

-r=91

r=91/-1

r=-91

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