\(\dfrac{8}{14}\) < \(\dfrac{◻}{19}\) < \(\dfrac{9}{14}\)
\(\dfrac{8\times19}{14\times19}\) < \(\dfrac{◻\times14}{14\times19}\) < \(\dfrac{9\times19}{14\times19}\)
8\(\times\)19 < \(◻\) \(\times\) 14 < 9\(\times\)19
152 < \(◻\) \(\times\) 14 < 171
\(\dfrac{152}{14}\) < \(◻\) < \(\dfrac{171}{14}\)
\(◻\) = 11; 12