Ответ:

[tex] \frac{2x {}^{2} - 13x + 21 }{2x {}^{2} - 18 } \\ \frac{2x {}^{2} - 6x - 7x + 21 }{2(x {}^{2} - 9)} \\ \frac{2x(x - 3) - 7(x - 3)}{2(x - 3)(x + 3)} \\ \frac{(x - 3)(2x - 7)}{2(x - 3)(x + 3) } \\ \frac{2x - 7}{2(x + 3)} \\ \frac{2x - 7}{2x + 6} [/tex]