$$x ^ { 2 } + 2 x y = 6 x$$
$\left\{\begin{matrix}\\y=-\frac{x}{2}+3\text{, }&\text{unconditionally}\\y\in \mathrm{C}\text{, }&x=0\end{matrix}\right.$
$\left\{\begin{matrix}\\y=-\frac{x}{2}+3\text{, }&\text{unconditionally}\\y\in \mathrm{R}\text{, }&x=0\end{matrix}\right.$
$x=6-2y$
$x=0$
