R-2=-1+3r+1+2

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Solution for R-2=-1+3r+1+2 equation: 



-2=-1+3R+1+2

We move all terms to the left:

-2-(-1+3R+1+2)=0

We add all the numbers together, and all the variables

-(3R+2)-2=0

We get rid of parentheses

-3R-2-2=0

We add all the numbers together, and all the variables

-3R-4=0

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

-3R=4

R=4/-3

R=-1+1/3

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