Verified Answer :

\(W=2 \dfrac{PR}{R} -r\) 

\(W=\dfrac{2PR}{R} -r\)  

\(W+r= \dfrac{2PR}{R}\)   \(Add \ r \ to \ both \ sides\) 

\((W+r)R=2PR\)  \(Multiply \ both \ sides \ by \ R\) 

\(R= \dfrac{2PR}{W+R}\)   \(Divide \ both \ sides \ by \ W+r\)

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