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padre x-8 x
hijo 2/5x - 8 2/5x
2/5x - 8 = 2/7 (x-8)
2x - 40 2x - 16
---------- = ----------
5 7
14x - 280 = 10x - 80
4x = 200
x = 50
2/5 x = 20
la edad del padre es 50
la edad del hijo 20