Tìm x

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1) \( x : \frac{8}{6} = \frac{3}{3} \)

2) \( \frac{3}{x} = \frac{21}{17} \)

3) \( \frac{-3}{x} = \frac{15}{7} \)

4) \( x : 5 = - \frac{8}{10} \)

5) \( \frac{x - 2}{3} = \frac{4}{5} \)

6) \( \frac{x + 3}{-4} = \frac{5}{20} \)

7) \( \frac{52}{2x - 1} = \frac{13}{30} \)

8) \( x + 1 = \frac{5}{x - 2} \)

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

10) \( \frac{2x + 3}{3x + 1} = \frac{3}{4} \)

11) \( \frac{11x - 2}{7x + 5} = \frac{11}{8} \)

12) \( \frac{6x - 5}{-7} = \frac{5x - 3}{-5} \)