Lös ut x_4
\left\{\begin{matrix}x_{4}\leq -\frac{2}{5-m}\text{, }&m>5\\x_{4}\geq -\frac{2}{5-m}\text{, }&m<5\\x_{4}\in \mathrm{R}\text{, }&m=5\\x_{4}=-\frac{2}{5-m}\text{, }&m\neq 5\end{matrix}\right,
Lös ut m
\left\{\begin{matrix}m\leq 5+\frac{2}{x_{4}}\text{, }&x_{4}>0\\m\geq 5+\frac{2}{x_{4}}\text{, }&x_{4}<0\\m\in \mathrm{R}\text{, }&x_{4}=0\\m=5+\frac{2}{x_{4}}\text{, }&x_{4}\neq 0\end{matrix}\right,
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