Solve: xx+1−xx−1=−2x2−1\frac{x}{x+1} - \frac{x}{x-1} = \frac{-2}{x^2 - 1}x+1x−x−1x=x2−1−2
x=−1x = -1x=−1
All real numbers except ±1\pm 1±1
x=1x = 1x=1
x=0x = 0x=0