Решите уравнение: (x+3)(x-3)-x(x+4)=0.

\[(x + 3)(x - 3) - x(x + 4) = 0\]

\[4x = - 9\]

\[x = - 2\frac{1}{4}\]

\[Ответ:\ x = - 2\frac{1}{4}.\]