Simplify: x2−x−6x2−9\dfrac{x^2 - x - 6}{x^2 - 9}x2−9x2−x−6 (assume x≠±3x \neq \pm 3x=±3).
x+2x+3\dfrac{x + 2}{x + 3}x+3x+2
x−2x−3\dfrac{x - 2}{x - 3}x−3x−2
x+2x−3\dfrac{x + 2}{x - 3}x−3x+2
x−3x+3\dfrac{x - 3}{x + 3}x+3x−3