$\left\{\begin{matrix}x=\frac{x_{2}+y_{2}}{2y}\text{, }&y\neq 0\\x\in \mathrm{C}\text{, }&x_{2}=-y_{2}\text{ and }y=0\end{matrix}\right.$

$\left\{\begin{matrix}x=\frac{x_{2}+y_{2}}{2y}\text{, }&y\neq 0\\x\in \mathrm{R}\text{, }&x_{2}=-y_{2}\text{ and }y=0\end{matrix}\right.$

$x_{2}=-\left(y_{2}-2xy\right)$