12=r/4+9

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Solution for 12=r/4+9 equation: 



12=r/4+9

We move all terms to the left:

12-(r/4+9)=0

We get rid of parentheses

-r/4-9+12=0

We multiply all the terms by the denominator


-r-9*4+12*4=0

We add all the numbers together, and all the variables

-1r+12=0

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

-r=-12

r=-12/-1

r=+12

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