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hani = i
a-5 = 1/2 (i-5)
2a - 10 = i - 5
2a = i + 5
i = 5 + a
maka => umur hana => 2a = 5 + a + 5 => a = 10 thn
umur hana 4 tahun lagi = 10 + 4 = 14