solution of inequality -2/5x-9<9/10
\(- \frac{2}{5}x-9\ \textless \ \frac{9}{10} \\(- \frac{2}{5}x-9\ \textless \ \frac{9}{10} )*10 \\ -4x-90\ \textless \ 9 \\ -4x\ \textless \ 9+90 \\ x\ \textgreater \ -\frac{99}{4}\)
