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vina = v
d = v x 9
4 + d = 5 (v + 4)
4 + d = 5v + 20
d = 5v + 16
9v = 5v + 16
4v = 16
v = 4thn
d = 9v = 36 thn
4 tahun yg akan datang
d => 4 + 36 = 40 thn
v => 4 + 4 = 8 thn