$$\frac{5}{10}=\frac{-2}{10}$$
$\text{false}$
$$\frac{1}{2}=\frac{-2}{10}$$
$$\frac{1}{2}=-\frac{1}{5}$$
$$\frac{5}{10}=-\frac{2}{10}$$
$$\text{false}$$
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