$$\left. \begin{array} { l } { 2 9 8 c w + 710 c m = r } \end{array} \right.$$
$r\in \mathrm{R}\text{, }c=\frac{r}{2\left(355m+72w\right)}\text{, }w\in \mathrm{R}\setminus -\frac{355m}{72},0\text{, }m\in \mathrm{R}$
$r=0\text{, }c\in \mathrm{R}\text{, }w=-\frac{355m}{72}\text{, }m\neq 0$
$r\in \mathrm{R}\text{, }c=\frac{r}{710m}\text{, }w=0\text{, }m\neq 0$
$r=0\text{, }c\in \mathrm{R}\text{, }w=0\text{, }m=0$
