$$\left. \begin{array} { l } { y } \\ { 11 x + 15 y + 23 = 0 } \\ { 7 x - 2 y - 20 = 0 } \end{array} \right.$$
$z=-3$
$$z=y$$ $$7x-2y-20=0$$ $$11x+15y+23=0$$
$$y=z$$
$$7x-2z-20=0$$ $$11x+15z+23=0$$
$$x=\frac{20}{7}+\frac{2}{7}z$$ $$z=-\frac{11}{15}x-\frac{23}{15}$$
$$z=-\frac{11}{15}\left(\frac{20}{7}+\frac{2}{7}z\right)-\frac{23}{15}$$
$$z=-3$$
$$x=\frac{20}{7}+\frac{2}{7}\left(-3\right)$$
$$x=2$$
$$y=-3$$
$$x=2$$ $$y=-3$$ $$z=-3$$
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