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X(2/7) = 2X/7 = Longitud que esta bajo tierra
X = 8 + 2X/7
X - 2X/7 = 8
X - 2X/7 = 7X/7 - 2X/7 = 5X/7
5X/7 = Parte visible del poste
5X/7 = 8
X = (8x7)/5
X = 56/5
X = 11.2 metros
El poste mide 11.2 metros