\(\frac{x}{8}=-\frac{6}{12}\Leftrightarrow x=-4\)
\(\frac{-8}{y^2}=-\frac{6}{12}\Leftrightarrow y^2=16\Leftrightarrow y=4\)
\(\frac{z}{-18}=-\frac{6}{12}\Leftrightarrow z=9\)
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\(\frac{x}{8}=\frac{-8}{y^2}=\frac{z}{-18}=-\frac{6}{12}\)
=>x=(-6).8:12=-4
y2=(-8).12:(-6)=16<=>y=+-4
z=(-6).(-18):12=9