\(\dfrac{-1}{9}.\dfrac{-3}{5}-\dfrac{5}{6}.\dfrac{3}{-5}+\dfrac{-5}{2}.\dfrac{3}{5}\\ =\dfrac{-1}{9}.\dfrac{-3}{5}-\dfrac{5}{6}.\dfrac{-3}{5}+\dfrac{5}{2}.\dfrac{-3}{5}\\ =\dfrac{-3}{5}\left(\dfrac{-1}{9}-\dfrac{5}{6}+\dfrac{5}{2}\right)\\ =\dfrac{-3}{5}.\dfrac{14}{9}\\ =\dfrac{-14}{15}\)