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Y = Edad Actual de Pablo
X - 8 = 3(Y - 8)
X - 8 = 3Y - 24
X = 3Y - 16;
(Y + 4) = (5/9)(X + 4)
9(Y + 4) = 5(X + 4)
9Y + 36 = 5X + 20
9Y = 5X - 16 Ecuacion 2
9Y = 5(3Y - 16) - 16
9Y = 15Y - 80 - 16
96 = 15Y - 9Y
96 = 6Y
Y = 16
X = 3Y - 16
X = 3(16) - 16 = 48 - 16 = 32
Edad de Maria 32
Edad de Juan 16