$$\left. \begin{array} { l } { x + y + z = ( x + y ) + z x = \frac { - 1 } { 2 } , y = \frac { 2 } { 4 } , z = \frac { - 2 } { 8 } } \\ { a \times ( b - c ) = a \times b - a \times c a = \frac { - 3 } { 2 } , b = \frac { 3 } { 2 } } \\ { p \right.$$
$\left\{\begin{matrix}\\x=1\text{, }&\text{unconditionally}\\x\in \mathrm{C}\text{, }&z=0\end{matrix}\right.$
$\left\{\begin{matrix}\\x=1\text{, }&\text{unconditionally}\\x\in \mathrm{R}\text{, }&z=0\end{matrix}\right.$
