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g+4 = 3(a+4)
g+4 = 3a+12
g = 3a+12-4 = 3a+8
(3a+8)-3 = 5a-15
8-3+15 = 5a-3a
2a = 20
a = 20/2
a = 10
g = 3a+8 = (3*10) + 8 = 38
Respuesta:
Gustavo: 38 años
Andrés: 10 años