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14 - 5 = 2 x adik - 1 thn
9 = 2 x adik - 1 thn
9 + 1 thn = 2 x adik
10 = 2 x adik
adik = 10 : 2 = 5 ( 5 tahun yg lalu)
sekarang adik umur = 5 + 5 = 10 thn
jadi umur adik sekarang = 4