x−5x+5\frac{x-5}{x+5}x+5x−5
x+5x−5\frac{x+5}{x-5}x−5x+5
x−1x−5\frac{x-1}{x-5}x−5x−1
x−1x+5\frac{x-1}{x+5}x+5x−1