$$\left. \begin{array} { l } { x = 1 - \frac { 8 } { x - 8 } } \\ { \quad \frac { 5 x - 8 } { x + 2 } } \\ { \quad \frac { 2 } { 5 x + 2 } } \\ { \frac { 10 x + 25 } { 15 x } } \\ { = \frac { 2 } { 5 } \cdot 15 \right.$$
$x=\frac{\sqrt{17}+9}{2}\approx 6.561552813\text{, }y=\frac{9\sqrt{17}+73}{38}\approx 2.897577648\text{, }z=\frac{49-5\sqrt{17}}{494}\approx 0.057458445\text{, }a=\frac{109-5\sqrt{17}}{96}\approx 0.920671582\text{, }b=6$
$x=\frac{9-\sqrt{17}}{2}\approx 2.438447187\text{, }y=\frac{73-9\sqrt{17}}{38}\approx 0.944527615\text{, }z=\frac{5\sqrt{17}+49}{494}\approx 0.140922122\text{, }a=\frac{5\sqrt{17}+109}{96}\approx 1.350161751\text{, }b=6$
