Solve P = 2R + 2S for R

Using the equation P = 2R + 2S,  write a formula that expresses R as a function of P and S.

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P = 2R + 2S
P - 2S = 2R   {subtracted 2s from each side} 

P - 2S
----------  =  R   {divided each side by 2}
   2

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