Find the set of all real values xxx such that x−1x≤xx+1\frac{x-1}{x} \leq \frac{x}{x+1}xx−1≤x+1x.
(-1, -0.5] \cup (0, \infty)
(-1, 0) \cup (0, 0.5]
(-1, 0) \cup [ -0.5, \infty)
(-1, 0) \cup [ -0.5, 0.5]