\frac{10}{3}\\ \frac{2}{5}x\leq -3\end{matrix}\right.\Leftrightarrow \left\{\begin{matrix}x>\frac{10}{3}\\ x\leq -\frac{15}{2}\end{matrix}\right.\Rightarrow x\in \varnothing" alt="\left\{\begin{matrix}x>\frac{10}{3}\\ \frac{2}{5}x\leq -3\end{matrix}\right.\Leftrightarrow \left\{\begin{matrix}x>\frac{10}{3}\\ x\leq -\frac{15}{2}\end{matrix}\right.\Rightarrow x\in \varnothing" align="absmiddle" class="latex-formula">