12=r+15

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Solution for 12=r+15 equation: 



12=r+15

We move all terms to the left:

12-(r+15)=0

We get rid of parentheses

-r-15+12=0

We add all the numbers together, and all the variables

-1r-3=0

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

-r=3

r=3/-1

r=-3

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