R=12+3x

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Solution for R=12+3x equation: 



=12+3R

We move all terms to the left:

-(12+3R)=0

We add all the numbers together, and all the variables

-(3R+12)=0

We get rid of parentheses

-3R-12=0

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

-3R=12

R=12/-3

R=-4

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