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(x + 5) Log(16) = (2 x + 1/7) Log(64^1/5);
16 = 2^4; luego Log(16) = 4 Log(2)
64 = 2^6; Log(64^1/5) = 6/5 Log(2); reemplazamos:
(x + 5) . 4 Log(2) = (2 x + 1/7) . 6/5 Log(2); simplificamos Log(2)
4 x + 20 = 12/5 x + 6/35
8/5 x = - 694/35
Finalmente x = - 347/28 = - 12,39
Saludos Herminio