$$\left. \begin{array} { l } { x - y = 3 } \\ { x = 0 } \\ { 0 + y = } \end{array} \right.$$
$z=-3$
$$0-y=3$$
$$-y=3$$
$$y=-3$$
$$z=0-3$$
$$z=-3$$
$$x=0$$ $$y=-3$$ $$z=-3$$
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