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

P = 2R + 2S

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

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

**P - 2S**

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

**2**

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