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Asfaltado: 5x/9
Empedrado: x/6
Tierra: 75 km
Sabemos que la suma de las partes es igual al total, entonces:
5x/9 + x/6 + 75 = x
(10x + 3x + 18*75)/18 = x
13x + 1350 = 18x
1350 = 5x
x = 270
El camino mide 270 km