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El número = x
3/4 del número = 3/4 de x = 3x/4
x - 10 = 3x/4
x - 3x/4 = 10
4x/4 - 3x/4 = 10
(4x - 3x)/4 = 10
x/4 = 10
x = 10 * 4
x = 40
Respuesta.
El número es el 40