Решите уравнение: (x-1)(x+1)-x(x-3)=0.

\[(x - 1)(x + 1) - x \cdot (x - 3) = 0\]

\[3x = 1\]

\[x = \frac{1}{3}\]

\[Ответ:x = \frac{1}{3}.\]