12=r+3

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Solution for 12=r+3 equation: 



12=r+3

We move all terms to the left:

12-(r+3)=0

We get rid of parentheses

-r-3+12=0

We add all the numbers together, and all the variables

-1r+9=0

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

-r=-9

r=-9/-1

r=+9

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