$$-7y-4x=1; 7y-2x=53; x=; y=$$
$z=-9$
$$z=x$$ $$7y-2x=53$$ $$-7y-4x=1$$
$$x=z$$
$$7y-2z=53$$ $$-7y-4z=1$$
$$y=\frac{2}{7}z+\frac{53}{7}$$ $$z=-\frac{7}{4}y-\frac{1}{4}$$
$$z=-\frac{7}{4}\left(\frac{2}{7}z+\frac{53}{7}\right)-\frac{1}{4}$$
$$z=-9$$
$$y=\frac{2}{7}\left(-9\right)+\frac{53}{7}$$
$$y=5$$
$$x=-9$$
$$y=5$$ $$x=-9$$ $$z=-9$$
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