Exercises 17-24: Solve the quadratic equation. 17. x - x - 20 = 0 18. -5x - 3x = 0 19. 422 - 7 = 0 20. 25:2 = 9 21. -2r - 31 + 14 = 0 22. x(6 – x) = -16 23. 0.1x² – 0.3x = 1 24. (k + 2) = 7

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