$$(-\frac{1}{4}+\frac{1}{9})\div[(\frac{1}{2}+\frac{1}{4})\div(-\frac{1}{8})]$$
$\frac{5}{216}\approx 0.023148148$
$$\frac{-\frac{9}{36}+\frac{4}{36}}{\frac{\frac{1}{2}+\frac{1}{4}}{-\frac{1}{8}}}$$
$$\frac{\frac{-9+4}{36}}{\frac{\frac{1}{2}+\frac{1}{4}}{-\frac{1}{8}}}$$
$$\frac{-\frac{5}{36}}{\frac{\frac{1}{2}+\frac{1}{4}}{-\frac{1}{8}}}$$
$$\frac{-\frac{5}{36}}{\frac{\frac{2}{4}+\frac{1}{4}}{-\frac{1}{8}}}$$
$$\frac{-\frac{5}{36}}{\frac{\frac{2+1}{4}}{-\frac{1}{8}}}$$
$$\frac{-\frac{5}{36}}{\frac{\frac{3}{4}}{-\frac{1}{8}}}$$
$$\frac{-\frac{5}{36}}{\frac{3}{4}\left(-8\right)}$$
$$\frac{-\frac{5}{36}}{\frac{3\left(-8\right)}{4}}$$
$$\frac{-\frac{5}{36}}{\frac{-24}{4}}$$
$$\frac{-\frac{5}{36}}{-6}$$
$$\frac{-5}{36\left(-6\right)}$$
$$\frac{-5}{-216}$$
$$\frac{5}{216}$$
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$\frac{5}{2 ^ {3} \cdot 3 ^ {3}} = 0.023148148148148147$
