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5% = 0.05
14% = 0.14
42 = Precio de Venta
42 = (0.05)(42) + (0.14)X + X
42 = 2.1 + 0.14X + X
42 = 2.1 + 1.14X
42 - 2.1 = 1.14X
39.9 = 1.14X
X = [39.9]/[1.14]
X = 35
El objeto costó $35