1)|1/х|=5/8 2)|1/у|=2/7 3)|1/z|=2/5 4)|2/х|=1/3

[latex] \frac{1}{|x|} = \frac{5}{8} \\|x|= \frac{8*1}{5} = \frac{8}{5} =1 \frac{3}{5} \\x=1 \frac{3}{5}; x=-1 \frac{3}{5} \\ \\ \frac{1}{|y|} = \frac{2}{7} \\|y|= \frac{7}{2} =3.5\\ y=3.5; y=-3.5\\ \\ \frac{1}{|z|} =\frac{2}{5} \\|z|=\frac{5}{2}=2.5\\z=2.5; z=-2.5\\ \\ \frac{2}{|x|}=\frac{1}{3} \\|x|=2*3=6\\x=6; x=-6[/latex]