3. 7x2 + 23x = -6 4. 9x2 - 9x = 4 5. x2 - 8x + 7 = 0 6. 8x2 + 22x = -5
7. 15x2 + 14x = 8
8. x2 - 25 = 0
9. x2 - 5x = 0
10. x2 - 7x = 0
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