Mathematical problem of nature

If the property of the eldest son is X, the property of the second son is (X+ 12000)/3, and the property of the eldest son is {(X+12000)/3+12000}/2, that is, X = {(X+). Then the property of the second child is: (9600+ 12000)/3=7200, and the legacy left by the old man is: 9600+7200+ 12000=28800 (yuan).

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