$$\frac{-17}{19}\times\frac{13}{20}=\frac{13}{20}\times\frac{-17}{19}$$
$\text{true}$
$$\frac{-17}{19}=\frac{-17}{19}$$
$$-\frac{17}{19}=\frac{-17}{19}$$
$$-\frac{17}{19}=-\frac{17}{19}$$
$$\text{true}$$
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