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Madre = m + 4
Resolvemos :
m + m + 4 = 80
2m + 4 = 80
2m = 80 - 4
2m = 76
m = 76/2
m = 38
m + 4 = 38 + 4 = 42
Solución :
El padre tiene = 38 años
La madre tiene = 42 años