Answer
$($-$\infty$, -$\frac{11}{2}$$]$
Work Step by Step
$\frac{2}{5}x$ - $\frac{1}{4}$ $\leq$ $\frac{3}{10}x$ - $\frac{4}{5}$
$\frac{2}{2}$( $\frac{2}{5}x$ ) - $\frac{5}{5}$( $\frac{1}{4}$ ) $\leq$ $\frac{3}{10}x$ - $\frac{4}{4}$( $\frac{4}{5}$ )
$\frac{4}{10}x$ - $\frac{5}{20}$ $\leq$ $\frac{3}{10}x$ - $\frac{16}{20}$
$\frac{1}{10}x$ $\leq$ -$\frac{11}{20}$
$20$( $\frac{1}{10}x$ ) $\leq$ $20$( -$\frac{11}{20}$ )
$2x$ $\leq$ $-11$
$x$ $\leq$ -$\frac{11}{2}$
In interval notation, the solution set is $($-$\infty$, -$\frac{11}{2}$$]$