Решите уравнение: -2/5*x=3/10.

\[- \frac{2}{5}x = \frac{3}{10}\]

\[x = \frac{3}{10}\ :\left( - \frac{2}{5} \right)\]

\[x = - \frac{3 \cdot 5}{10 \cdot 2}\]

\[x = - \frac{3}{4}\]

\[x = - 0,75.\]