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5thn kmudian >> a+y = 46
y-30+y = 46
y = 76/2
y = 38
umur a = 38 - 30 = 8
i2 umurnya klo 5 thn kmudian.. klo bukan 5 thun kmudian yg dtanyakan maka jwbnnya tnggal dkurangi masing 5