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Luego: x + y + z = 72:
y = 1/5 z; x = z + 6; reemplazamos en la suma:
z + 6 + 1/5 z + z = 72
z + 1/5 z + z = 66: 11/5 z = 66; z = 66 . 5/11 = 30
x = 36; y = 6
Verificamos: 36 + 6 + 30 = 72
Saludos Herminio