\[\frac{1}{x - 4} - \frac{3}{x^{2} + 4x + 16} = \frac{9x + 12}{x^{3} - 64}\]
\[\frac{1}{x - 4} - \frac{3}{x^{2} + 4x + 16} =\]
\[= \frac{9x + 12}{(x - 4)\left( x^{2} + 4x + 16 \right)};\ \ \ \ \ \]
\[x \neq 4\]
\[x^{2} - 5x + 4 - 3x + 12 = 0\]
\[x^{2} - 8x + 16 = 0\]
\[(x - 4)^{2} = 0\]
\[x - 4 = 0\ \ \]
\[x = 4\ \ (не\ подходит).\]
\[Ответ:нет\ решения.\]