\[- 3x = 2\frac{2}{5}\]
\[x = 2\frac{2}{5}\ :( - 3)\]
\[x = \frac{12}{5}\ :( - 3)\]
\[x = - \frac{12}{5 \cdot 3}\]
\[x = - \frac{4}{5}\]
\[x = - \frac{8}{10}\]
\[x = - 0,8.\]