Ответ:

\(2\dfrac{3}{8}=\dfrac{19}{8}\), \(1.5=\dfrac32\).

\(\dfrac{19}{8}-\dfrac{9}{14}=\dfrac{97}{56}\).

\(-5\cdot\dfrac{97}{56}\cdot\dfrac32=-\dfrac{1455}{112}=-12\dfrac{111}{112}\).

Ответ: \(-12\dfrac{111}{112}\).