39=r-12

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Solution for 39=r-12 equation: 



39=r-12

We move all terms to the left:

39-(r-12)=0

We get rid of parentheses

-r+12+39=0

We add all the numbers together, and all the variables

-1r+51=0

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

-r=-51

r=-51/-1

r=+51

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