$\left\{\begin{matrix}\\c=0\text{, }&\text{unconditionally}\\c\in \mathrm{R}\text{, }&m=\frac{13}{2}\end{matrix}\right.$

$\left\{\begin{matrix}\\m=\frac{13}{2}\text{, }&\text{unconditionally}\\m\in \mathrm{R}\text{, }&c=0\end{matrix}\right.$