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12. (-3×-4) ÷ 2 = 12 ÷ 2 = 6
13. (8×4) ÷ 2 - 10 = (32÷2) - 10 = 16-10 = 6
14. -30 ÷ (-15×4) + 10 = (-30 ÷ -60) + 10 = 1/2 + 10 = 0,5 + 10 = 10,5
15. -15 + ((-12) ÷ 3) = -15 + (-4) = -19
16. 72 + ((-25) × 2) - 13 = (72 + (-50)) - 13 = 22 - 13 = 9
17. 20 - (3×6) + (21÷3) = 20 - (18 + 7) = 20 - 25 = -5
18. (60 ÷ 20) + 15 = 3 + 15 = 18
19. 6 + ((-10) × 3) - 5 = (6 + (-30)) - 5 = -24 - 5 = -29
20. 14 + ((-9) × 4) + (-4) = 14 + (-36) - 4 = -22 - 4 = -26