R=12+4r

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Solution for R=12+4r equation: 



=12+4R

We move all terms to the left:

-(12+4R)=0

We add all the numbers together, and all the variables

-(4R+12)=0

We get rid of parentheses

-4R-12=0

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

-4R=12

R=12/-4

R=-3

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