$$\frac{1}{2}\div\frac{3}{4}; of\frac{2}{5}$$
$-\frac{5}{8}=-0.625$
$$\frac{\frac{2}{4}-\frac{3}{4}}{\frac{2}{5}}$$
$$\frac{\frac{2-3}{4}}{\frac{2}{5}}$$
$$\frac{-\frac{1}{4}}{\frac{2}{5}}$$
$$-\frac{1}{4}\times \frac{5}{2}$$
$$\frac{-5}{4\times 2}$$
$$\frac{-5}{8}$$
$$-\frac{5}{8}$$
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$-\frac{5}{8} = -0.625$