Sasha is incorrect. you would add the 8x and the 3x not subtract them. Dante is correct because he adds 3x and 5x and he also adds 6 to both sides of the equation. Hope I helped!
I believe the answer is C. Joe knows he gave away 10 tickets
14. [-27, 0, 1.728, 125]
15. [ 18, 15, 13.8, 10]
16. [-3.9, 0, 1.56, 6.5]
17. [9, 0, 1.44, 25]
18. [12, 0, -4.8, -20]
19. [10, 1, 2.44, 26]
20. [64, 25, 14.44. 0]
21. [-22, -4, 3.2, 26]
9x² + 12x - 6 = x² - 7
Take the ones on the right to the left
9x² - x² + 12x -6 + 7 = 0
8x² + 12x + 1 = 0