Which expression equals 5x/x² - 9 - 4 x / x² + 5x + 6?
(A) 7 x/(x-3)(x+3)(x+2) (B) x²-2 x / (x-3)(x+3)(x+2)
(C) x²+22x / x-3)(x+3)(x+2)
(D) 9x² - 2 x / (x-3)(x+3)(x+2)