$$\frac { 7 } { - 9 } = \frac { 7 \times ( - 1 ) } { - 9 \times ( - 1 ) } = \frac { - 7 } { 9 }$$
$\text{true}$
$$-\frac{7}{9}=\frac{7\left(-1\right)}{-9\left(-1\right)}\text{ and }\frac{7\left(-1\right)}{-9\left(-1\right)}=\frac{-7}{9}$$
$$-\frac{7}{9}=\frac{7}{-9}\text{ and }\frac{7\left(-1\right)}{-9\left(-1\right)}=\frac{-7}{9}$$
$$-\frac{7}{9}=-\frac{7}{9}\text{ and }\frac{7\left(-1\right)}{-9\left(-1\right)}=\frac{-7}{9}$$
$$\text{true}\text{ and }\frac{7\left(-1\right)}{-9\left(-1\right)}=\frac{-7}{9}$$
$$\text{true}\text{ and }\frac{7}{-9}=\frac{-7}{9}$$
$$\text{true}\text{ and }-\frac{7}{9}=\frac{-7}{9}$$
$$\text{true}\text{ and }-\frac{7}{9}=-\frac{7}{9}$$
$$\text{true}\text{ and }\text{true}$$
$$\text{true}$$
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