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Sobrino = x
Resolvemos :
3x + x = 2 (x + 11)
3x + x = 2x + 22
4x = 2x + 22
4x - 2x = 22
2x = 22
x = 22/2
x = 11
2x = 2 (11) = 22
Solución :
Capitán 22 años
Sobrino 11 años