Simplify [7\(\frac{1}{2}\) ÷ {1\(\frac{1}{4}\) - \(\frac{1}{2}\) (2\(\frac{1}{2}\) - \(\overline {\frac{1}{4} - \frac{1}{6}} \))}] ÷ (\(\frac{1}{2}\) of 8\(\frac{1}{3}\)).