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9. $(3, - 1)$
11. None of them
13. $(10, - 9)$
15. (2, 1)
17. (2, 2)
19. Inconsistent
21. $(\frac{7}{3}, \frac{14}{3})$
23. ${(x, 12 - 3 x)}$
25. Independent
27. Independent
29. Dependent
31. Independent
33. Inconsistent
35. Inconsistent
37. Independent ...

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