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R + 2/7 = D - 3
Despejamos R
(7R + 2)/7 = D - 3
7R + 2 = 7 (D - 3)
7R + 2 = 7D - 21
7R = 7D - 21 - 2
7R = 7D - 23
R = (7D - 23)/7
Respuesta-
R = (7D - 23)/7