$$\frac { - 2 } { 5 } = \frac { - 2 \times 9 } { 5 \times 9 } = \frac { - 18 } { 45 }$$
$\text{true}$
$$-\frac{2}{5}=\frac{-2\times 9}{5\times 9}\text{ and }\frac{-2\times 9}{5\times 9}=\frac{-18}{45}$$
$$-\frac{2}{5}=\frac{-2}{5}\text{ and }\frac{-2\times 9}{5\times 9}=\frac{-18}{45}$$
$$-\frac{2}{5}=-\frac{2}{5}\text{ and }\frac{-2\times 9}{5\times 9}=\frac{-18}{45}$$
$$\text{true}\text{ and }\frac{-2\times 9}{5\times 9}=\frac{-18}{45}$$
$$\text{true}\text{ and }\frac{-2}{5}=\frac{-18}{45}$$
$$\text{true}\text{ and }-\frac{2}{5}=\frac{-18}{45}$$
$$\text{true}\text{ and }-\frac{2}{5}=-\frac{2}{5}$$
$$\text{true}\text{ and }\text{true}$$
$$\text{true}$$
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