Simplify: 1x+2+1x−2−4x2−4\frac{1}{x+2} + \frac{1}{x-2} - \frac{4}{x^2-4}x+21+x−21−x2−44.
1x−2\frac{1}{x-2}x−21
2x+2\frac{2}{x+2}x+22
2x−4x2−4\frac{2x-4}{x^2-4}x2−42x−4
2xx2−4\frac{2x}{x^2-4}x2−42x