$$\left\{ \left[ \left( \dfrac{1}{2}+\dfrac{2}{3}-\dfrac{4}{5}\cdot \dfrac{3}{2}\right) -\dfrac{6}{5}+\dfrac{1}{4}\right] -\dfrac{1}{10}\right\} +\left\{ \left[ \left( \dfrac{2}{5}-\dfrac{1}{2}\cdot \dfrac{2}{5}\right) -\dfrac{6}{5}+\dfrac{2}{3}\right] \cdot \dfrac{1}{4}\right\}=$$

$$\left\{ \left[ \left( \dfrac{1}{2}+\dfrac{2}{3}-\dfrac{6}{5}\right) -\dfrac{6}{5}+\dfrac{1}{4}\right] -\dfrac{1}{10}\right\} +\left\{ \left[ \left( \dfrac{2}{5}-\dfrac{1}{5}\right) -\dfrac{6}{5}+\dfrac{2}{3}\right] \cdot \dfrac{1}{4}\right\}=$$

$$\left\{ \left[ \left( \dfrac{15+20-36}{30}\right) -\dfrac{6}{5}+\dfrac{1}{4}\right] -\dfrac{1}{10}\right\} +\left\{ \left[ \dfrac{1}{5}-\dfrac{6}{5}+\dfrac{2}{3}\right] \cdot \dfrac{1}{4}\right\}=$$

$$\left\{\left[ -\dfrac{1}{30}-\dfrac{6}{5}+\dfrac{1}{4}\right] -\dfrac{1}{10}\right\} +\left\{ \left[ \dfrac{3-18+10}{15}\right] \cdot \dfrac{1}{4}\right\}=$$

$$\left\{ \left[ \dfrac{-2-72+15}{60}\right] -\dfrac{1}{10}\right\} +\left\{ -\dfrac{5}{15}\cdot \dfrac{1}{4}\right\}=$$

$$\left\{ -\dfrac{59}{60}-\dfrac{1}{10}\right\}+ \left\{ -\dfrac{1}{3}\cdot \dfrac{1}{4}\right\}=$$

$$\left\{ \dfrac{-59-6}{60}\right\} -\dfrac{1}{12}=$$

$$-\dfrac{13}{12}-\dfrac{1}{12}=$$

$$-\dfrac{14}{12}=$$

$$-\dfrac{7}{6}$$