R-r+3r-r=20

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Solution for R-r+3r-r=20 equation: 



-R+3R-R=20

We move all terms to the left:

-R+3R-R-(20)=0

We add all the numbers together, and all the variables

R-20=0

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

R=20

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