12=9+r/7

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Solution for 12=9+r/7 equation: 



12=9+r/7

We move all terms to the left:

12-(9+r/7)=0

We add all the numbers together, and all the variables

-(r/7+9)+12=0

We get rid of parentheses

-r/7-9+12=0

We multiply all the terms by the denominator


-r-9*7+12*7=0

We add all the numbers together, and all the variables

-1r+21=0

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

-r=-21

r=-21/-1

r=+21

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