\[ \frac{x}{5} - \frac{5x}{5} = \frac{16}{25} \]
\[ \frac{x - 5x}{5} = \frac{16}{25} \]
\[ \frac{-4x}{5} = \frac{16}{25} \]
\[ -4x = \frac{16}{25} \cdot 5 \]
\[ -4x = \frac{16 \cdot 5}{25} = \frac{16 \cdot 1}{5} = \frac{16}{5} \]
\[ x = \frac{16}{5} : (-4) = \frac{16}{5} \cdot \left(-\frac{1}{4}\right) \]
\[ x = -\frac{16}{5 \cdot 4} = -\frac{16}{20} \]
\[ x = -\frac{4}{5} \]
Ответ: -4/5