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X - 6 = Edad hace 6 años
X - 6 = X/4
4(X - 6) = X
4X - 24 = X
4X - X = 24
3X = 24
X = 8.
Prueba hace 6 años
(8 - 6) = 8/4
2 = 2
Rta: Tienes 8 años