8=4r+12

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Solution for 8=4r+12 equation: 



8=4r+12

We move all terms to the left:

8-(4r+12)=0

We get rid of parentheses

-4r-12+8=0

We add all the numbers together, and all the variables

-4r-4=0

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

-4r=4

r=4/-4

r=-1

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