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Sobrino = x
2x + 5 + x + 5 = 70
2x + x + 5 + 5 = 70
3x + 10 = 70
3x = 70 - 10
3x = 60
x = 603
x = 20
2x = 2 (20) = 40
Solución :
El capitán tiene = 40 años
El sobrino tiene = 20 años