$$-4/5 \times 1=1 \times -4/5=-4/5$$
$\text{true}$
$$-\frac{4}{5}=\frac{1\left(-4\right)}{5}\text{ and }\frac{1\left(-4\right)}{5}=\frac{-4}{5}$$
$$-\frac{4}{5}=\frac{-4}{5}\text{ and }\frac{1\left(-4\right)}{5}=\frac{-4}{5}$$
$$-\frac{4}{5}=-\frac{4}{5}\text{ and }\frac{1\left(-4\right)}{5}=\frac{-4}{5}$$
$$\text{true}\text{ and }\frac{1\left(-4\right)}{5}=\frac{-4}{5}$$
$$\text{true}\text{ and }\frac{-4}{5}=\frac{-4}{5}$$
$$\text{true}\text{ and }-\frac{4}{5}=\frac{-4}{5}$$
$$\text{true}\text{ and }-\frac{4}{5}=-\frac{4}{5}$$
$$\text{true}\text{ and }\text{true}$$
$$\text{true}$$
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