R-r=12+6r

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Solution for R-r=12+6r equation: 



-R=12+6R

We move all terms to the left:

-R-(12+6R)=0

We add all the numbers together, and all the variables

-R-(6R+12)=0

We add all the numbers together, and all the variables

-1R-(6R+12)=0

We get rid of parentheses

-1R-6R-12=0

We add all the numbers together, and all the variables

-7R-12=0

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

-7R=12

R=12/-7

R=-1+5/7

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