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dedi = d
#saat ini
i = d - 3
i + d = 19
(d-3) + d = 19
2d = 19+3
2d = 22
d = 11 tahun
i = d - 3 = 11 - 3 = 8 tahun
#4 tahun yad
i = 8 + 4 = 12 thn
d = 11 + 4 = 15 thn
perbandingan umur indra dan dedi = 12 : 15 = 4 : 5