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1/R - 1/R3 = 1/R2
desarrollamos
(R3-R)/(R*R3) = 1/R2
pasamos R2 ...
R2 * (R3-R) / (R*R3)= 1
despejamos R2
R2*(R3-R)= 1*(R*R3)
R2= (R*R3)/(R3-R)