\[\left( m - \frac{4}{15} \right)\ :\frac{4}{5} = 1,5\]
\[m - \frac{4}{15} = \frac{3}{2} \cdot \frac{4}{5}\]
\[m - \frac{4}{15} = \frac{6}{5}\]
\[m = \frac{6^{\backslash 3}}{5} + \frac{4}{15}\]
\[m = \frac{22}{15} = 1\frac{7}{15}.\]