$$\left. \begin{array} { l } { x + A y = 3 } \\ { ( 2 A - 1 ) y + 2 z = 5 } \\ { 2 x - A y + z = 5 } \end{array} \right.$$
$x=\frac{3-17A}{1-8A}$
$y=-\frac{7}{1-8A}$
$z=\frac{13A+1}{8A-1}$
$A\neq \frac{1}{8}$
