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Ali = x...... Vina = y
x = 9y
x + 4 = 5( y + 4)
x + 4 = 5y + 20
x - 5y = 20 - 4
x - 5y = 16
9y - 5y = 16
4y = 16
y(Vina) = 4
x(Ali) =9*4 = 36
empat tahun Kemudian
y = 4 + 4 = 8
x = 36 + 4 = 40