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-9X MENOS O IGUAL A 5/4 -1 RESOLVEMOS LA RESTAS DE FRACCIONES
5/4 - 1 = 1/4
AHORA -9X <= 1/4 CAMBIAMOS SIGNOS Y DESIGUALDAD SENTIDO
9X > = -1/4 PASAMOS 9 MULTIPLICANDO AL DENOMINADOR 4
X >= -1/36
SOLUCION X PERTENECIENTE AL INTERVALO [-1/36, AL INFINITO)