Tìm x

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9) \(\frac{x+2}{x^2 + 1} = \frac{3}{x - 4}\)

11) \(\frac{2}{15} = \frac{3}{3x + 1} - \frac{6x^2 - x - 1}{2x - 1}\)

13) \(\frac{2}{4} = \frac{3x + 11}{x - 1} + \frac{2x^2 - 2x - 3}{x^2 + 2x - 3}\)

15) \(\frac{3}{2x + 1} = \frac{5x + 4}{x^2 + 3x + 2}\)

17) \(\frac{x + 1}{2x - 2} - \frac{x - 1}{2x + 2} = \frac{2}{x^2 - 1}\)

19) \(\frac{x + 1}{2x - 2} - \frac{x - 1}{2x + 2} = \frac{2}{x^2 - 1}\)

21) \(\frac{x}{2x - 6} + \frac{2x + 2}{2x + 2} = -2x(3 - x)(x + 1)\)

23) \(\frac{1}{x^2 - 1} + \frac{2}{x - 1} = \frac{3}{2x + 2}\)

25) \(\frac{9x^2 + 6}{x^3 - 8 + x^2 + 2x + 4} = \frac{3}{x - 2}\)