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-9+2 ≤ -6x-2+2 < 0+2
-7 ≤ -6x < 2
Dividimos todo entre -6, recordando cambiar el sentido de la desigualdad:
7/6 ≥ x > -1/3
Entonces la solución es:
C.S.={x | 7/6 ≥ x > -1/3}
O (-1/3,7/6]