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N1= nota numero 1 = 6.4
N2= nota numero 2 = 7.8
N3= nota numero 3 = ?
P= promedio total = 8
P = (N1 + N2 + N3) / 3 asi sacamos el promedio
8 = (6.4 + 7.8 + N3) / 3; despejamos y operamos
8 * 3 = 14.2 + N3
24 - 14.2 = N3
9.8 = N3 esta es la nota que debe sacar para obtener un promedio total de 8