R-r+2r+3r=15

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Solution for R-r+2r+3r=15 equation: 



-R+2R+3R=15

We move all terms to the left:

-R+2R+3R-(15)=0

We add all the numbers together, and all the variables

4R-15=0

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

4R=15

R=15/4

R=3+3/4

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