The value of \(\left( {5\frac{1}{4} \div \frac{3}{7}of\frac{1}{2}} \right) \div \left( {5\frac{1}{9} - 7\frac{7}{8} \div 9\frac{9}{{20}}} \right)\; \times \;\frac{{11}}{{21}}\; + \;\left( {2 \div 2\;of\frac{1}{2}} \right)\) is: