এর মান : \(\left[ {\frac{5}{7}\;of\;1\frac{3}{8} - \frac{5}{8}\;of\frac{6}{7}} \right]\; \div \left[ {1 - \frac{1}{7} \times \;\left( {\frac{5}{{12}} + \frac{1}{3}} \right)} \right] \times \frac{{\frac{1}{7} - \frac{1}{9}}}{{\frac{1}{7} + \frac{1}{9}}}\)