4=r+12

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Solution for 4=r+12 equation: 



4=r+12

We move all terms to the left:

4-(r+12)=0

We get rid of parentheses

-r-12+4=0

We add all the numbers together, and all the variables

-1r-8=0

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

-r=8

r=8/-1

r=-8

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