$$Q(2)\frac{-17}{19}\times\frac{13}{20}=\frac{13}{20}\times\frac{-17}{19}$$
$Q=\frac{1}{2}=0.5$
$$Q\times 2\times \frac{-17}{19}=\frac{-17}{19}$$
$$Q\times 2\left(-\frac{17}{19}\right)=\frac{-17}{19}$$
$$Q\times \frac{2\left(-17\right)}{19}=\frac{-17}{19}$$
$$Q\times \frac{-34}{19}=\frac{-17}{19}$$
$$Q\left(-\frac{34}{19}\right)=\frac{-17}{19}$$
$$Q\left(-\frac{34}{19}\right)=-\frac{17}{19}$$
$$Q=-\frac{17}{19}\left(-\frac{19}{34}\right)$$
$$Q=\frac{-17\left(-19\right)}{19\times 34}$$
$$Q=\frac{323}{646}$$
$$Q=\frac{1}{2}$$
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