[tex]1 \frac{8}{9} < \frac{x}{9} < 2 \frac{4}{9} \\ \frac{17}{9} < \frac{x}{9} < \frac{22}{9} \: \: | \times 9 \\ 17 < x < 22 \\ x \: \in \: (17 \: ; \: 22)[/tex]