помогите решить уравнение
[tex] \frac{1}{(x {}^{2} + 3x) {}^{2} + 1} + \frac{3}{(x + 3) {}^{2} + 1} + \frac{5}{(x {}^{2} + 2x - 3) {}^{2} + 1 } = 9[/tex]
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