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4X = 324
X = 324/4
X = 81
Una casaca cuesta S/. 81
Y = Precio de una camisa
9Y = 324
Y = 324/9
Y = 36
Una camisa cuesta S/. 36
81 - 36 = 45
La diferencia de precio entre una casaca y una camisa es de: S/. 45