सरल कीजिए : \(\left[ 5 \frac{1}{4} \div \left\lbrace 1 \frac{1}{4} - \frac{1}{2} \left( 2 \frac{1}{2} - \overline{\frac{1}{4} -{\frac{1}{6}}} \right) \right\rbrace \right]\,\)