$$\left. \begin{array} { l } { x = \frac { 2 } { 5 } , y = \frac { 1 } { 2 } } \\ { [ ( x + y ) ] \div [ ( x - y ) ] } \end{array} \right.$$
$z=-9$
$$z=\frac{\frac{2}{5}+\frac{1}{2}}{\frac{2}{5}-\frac{1}{2}}$$
$$z=\frac{\frac{9}{10}}{\frac{2}{5}-\frac{1}{2}}$$
$$z=\frac{\frac{9}{10}}{-\frac{1}{10}}$$
$$z=\frac{9}{10}\left(-10\right)$$
$$z=-9$$
$$x=\frac{2}{5}$$ $$y=\frac{1}{2}$$ $$z=-9$$
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