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11. 5. \(\frac{x-5}{x} + \frac{x-3}{x+5} = \frac{x-25}{x^2+5x};\)

12. 8. \(\frac{4x}{x-2} - \frac{1}{x-1} = \frac{8x-7}{3x-6}; 0; \)

6. \(\frac{x+7}{x-7} - \frac{7}{x^2-7x} = \frac{1}{x};\)

7. \(\frac{4x}{4x-3} + \frac{5}{3x-4x^2} = \frac{x+2}{x};\)

9. \(\frac{1}{2x-2} + \frac{2}{x+1} = \frac{5}{3x+3};\)

10. \(\frac{x+1}{2x-2} - \frac{x-1}{2x+2} + \frac{2x}{(1-x)(x+1)} =\)