12=4r-4

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Solution for 12=4r-4 equation: 



12=4r-4

We move all terms to the left:

12-(4r-4)=0

We get rid of parentheses

-4r+4+12=0

We add all the numbers together, and all the variables

-4r+16=0

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

-4r=-16

r=-16/-4

r=+4

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