$$\left. \begin{array} { l } { - 7 x y q ^ { 2 } - 5 x - 5 y + k = 0 } } \\ { \text { 0 f \right.$$
$\left\{\begin{matrix}x=\frac{k-5y}{7yq^{2}+5}\text{, }&q=0\text{ or }y\neq -\frac{5}{7q^{2}}\\x\in \mathrm{C}\text{, }&y=-\frac{5}{7q^{2}}\text{ and }k=-\frac{25}{7q^{2}}\text{ and }q\neq 0\end{matrix}\right.$
$\left\{\begin{matrix}x=\frac{k-5y}{7yq^{2}+5}\text{, }&q=0\text{ or }y\neq -\frac{5}{7q^{2}}\\x\in \mathrm{R}\text{, }&y=-\frac{5}{7q^{2}}\text{ and }k=-\frac{25}{7q^{2}}\text{ and }q\neq 0\end{matrix}\right.$
