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4/7 * x = 7/4
4x/7 = 7/4
4x = 7/4 * 7
4x = 49/4
x = 49/4 : 4
x = 49/4 * 1/4
x = 49/16
Comprobamos :
4/7 * 49/16 = (4 * 49)/(7 * 16) = 7/4
Respuesta.
49/16