\left\{ \begin{array} { l } { ( 2 a - b ) x + a - 5 b > 0 } \\ { x < \frac { 10 } { 7 } } \end{array} \right.
解 x
\left\{\begin{matrix}x<\frac{10}{7}\text{, }&\left(b<0\text{ and }a=\frac{b}{2}\right)\text{ or }\left(a>\frac{5b}{3}\text{ and }a<\frac{b}{2}\right)\\x<-\frac{a-5b}{2a-b}\text{, }&a\leq \frac{5b}{3}\text{ and }a<\frac{b}{2}\\x\in \left(-\frac{a-5b}{2a-b},\frac{10}{7}\right)\text{, }&a>\frac{5b}{3}\text{ and }a>\frac{b}{2}\end{matrix}\right.
解 b
\left\{\begin{matrix}b<\frac{a\left(2x+1\right)}{x+5}\text{, }&x>-5\text{ and }x<\frac{10}{7}\\b\in \mathrm{R}\text{, }&x=-5\text{ and }a<0\\b>\frac{a\left(2x+1\right)}{x+5}\text{, }&x<-5\end{matrix}\right.
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