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(x-5) + (X-9) + X = 103
3X - 14 = 103
3X = 103+14
X = 117/3
X =39
X-5= 39-5 = 34 -> Blas
X -9= 39-9= 30 -> Adrián
Respuesta: Carlos tiene 39 años, Blas tiene 34 y Adrián 30 años de edad.