$$\left\{ \left[ \dfrac{2}{11}:\dfrac{3}{4}+\dfrac{5}{6}:\left( \dfrac{2}{3}-\dfrac{1}{7}\right) \right] :\left[ 1+\dfrac{3}{11}\cdot \left( \dfrac{\cancelto{4}{20}}{\cancelto{1}{9}}\cdot \dfrac{\cancelto{1}{9}}{\cancelto{5}{25}}+\dfrac{2}{3}\right) \cdot \dfrac{5}{2}-\dfrac{7}{16}\right] \right\} \cdot \dfrac{25}{33}=$$

$$\left\{ \left[ \dfrac{2}{11}\cdot \dfrac{4}{3}+\dfrac{5}{6}:\left( \dfrac{14-3}{21}\right) \right] :\left[ 1+\dfrac{3}{11}\cdot \left( \dfrac{4}{5}+\dfrac{2}{3}\right) \cdot \dfrac{5}{2}-\dfrac{7}{16}\right] \right\} \cdot \dfrac{25}{33}=$$

$$\left\{ \left[ \dfrac{8}{33}+\dfrac{5}{\cancelto{2}{6}}\cdot \dfrac{\cancelto{7}{21}}{11}\right] :\left[ 1+\dfrac{3}{11}\cdot \left( \dfrac{12+10}{15}\right) \cdot \dfrac{5}{2}-\dfrac{7}{16}\right] \right\} \cdot \dfrac{25}{33}=$$

$$\left\{ \left[ \dfrac{8}{33}+\dfrac{35}{22}\right] :\left[ 1+\dfrac{\cancelto{1}{3}}{\cancelto{1}{11}}\cdot \dfrac{\cancelto{2}{22}}{\cancelto{5}{15}}\cdot \dfrac{5}{2}-\dfrac{7}{16}\right] \right\} \cdot \dfrac{25}{33}=$$

$$\left\{ \left[ \dfrac{16+105}{66}\right] :\left[ 1+\dfrac{2}{5}\cdot \dfrac{5}{2}-\dfrac{7}{16}\right] \right\} \cdot \dfrac{25}{33}=$$

$$\left\{ \dfrac{121}{66}:\left[ 1+1-\dfrac{7}{16}\right] \right\} \cdot \dfrac{25}{33}=$$

$$\left\{ \dfrac{11}{6}:\left[ \dfrac{16+16-7}{16}\right] \right\} \cdot \dfrac{25}{33}=$$

$$\dfrac{11}{6}\cdot \dfrac{16}{25}\cdot \dfrac{25}{33}=$$

$$\dfrac{\cancelto{1}{11}}{\cancelto{3}{6}}\cdot \dfrac{\cancelto{8}{18}}{\cancelto{1}{25}}\cdot \dfrac{\cancelto{1}{25}}{\cancelto{3}{33}}=$$

$$\dfrac{8}{9}$$