\[\frac{x}{x - 4} - \frac{16}{x^{2} - 4x} = 0\]
\[\frac{x}{x - 4} - \frac{16}{x(x - 4)} = 0\ \ \ \ | \cdot x(x - 4)\]
\[ОДЗ:\ x \neq 0;\ \ \ x \neq 4\]
\[x^{2} - 16 = 0\]
\[(x - 4)(x + 4) = 0\]
\[x - 4 = 0\ \ \ \ \ \ \ \ \ x = 4 - не\ подходит.\]
\[x + 4 = 0\ \ \ \ \ \ \ \ x = - 4.\]
\[Ответ:\ x = - 4.\]