$$\left[ \left( \dfrac{3}{4}+\dfrac{1}{2}-\dfrac{9}{10}\right) :\left( \dfrac{1}{4}+\dfrac{6}{5}-1\right) -\left( \dfrac{5}{3}-\dfrac{1}{9}+\dfrac{11}{3}\right) +\left( -\dfrac{8}{3}+\dfrac{1}{9}\right) \right] :\left( -\dfrac{7}{3}\right)=$$

$$\left[ \left( \dfrac{15+10-18}{20}\right) :\left( \dfrac{5+24-20}{20}\right) -\left( \dfrac{15-1+33}{9}\right) +\left( \dfrac{-24+1}{9}\right) \right] \cdot \left( -\dfrac{3}{7}\right)=$$

$$\left[ \dfrac{7}{20}\cdot \dfrac{20}{9}-\dfrac{47}{9}-\dfrac{23}{9}\right] \cdot \left( -\dfrac{3}{7}\right)=$$

$$\left[ \dfrac{7}{9}-\dfrac{47}{9}-\dfrac{23}{9}\right] \cdot \left( -\dfrac{3}{7}\right)=$$

$$-\dfrac{63}{9}\cdot \left( -\dfrac{3}{7}\right)=$$

$$3$$