\(\left[ {\frac{{21}}{{10}} + \frac {{13}}{5}} \right]\) + \(\left[ {\frac{1}{{10}} \times \frac{{10}}{{47}} - \frac{6}{{47}}} \right]\) ના \(\frac{7}{10}\)÷ \(\frac{7}{5}\) નું મૂલ્ય શોધો.