Solve the math equations:

Okay, let's solve these math problems one by one!

1. 14 + [] + 3 = 12 => [] = 12 - 14 - 3 => [] = -5. Given that it is only positive numbers that can be entered, there is no solution.

2. 19 + [] - 6 = 14 => [] = 14 - 19 + 6 => [] = 1

3. 20 - [] + 7 = 10 => [] = 20 + 7 - 10 => [] = 17

4. [] + 5 - 8 = 12 => [] = 12 - 5 + 8 => [] = 15

5. 13 + [] - 3 = 18 => [] = 18 - 13 + 3 => [] = 8

6. 10 + [] + 3 = 16 => [] = 16 - 10 - 3 => [] = 3

7. 11 + [] + 12 = 17 => [] = 17 - 11 - 12 => [] = -6. Given that it is only positive numbers that can be entered, there is no solution.

8. 14 - [] + 4 = 15 => [] = 14 + 4 - 15 => [] = 3

9. 13 - 8 + [] = 16 => [] = 16 - 13 + 8 => [] = 11

10. 18 - [] + 10 = 20 => [] = 18 + 10 - 20 => [] = 8

11. 15 + [] - 8 = 10 => [] = 10 - 15 + 8 => [] = 3

12. 16 - [] + 7 = 17 => [] = 16 + 7 - 17 => [] = 6

13. 11 + 3 - [] = 19 => [] = 11 + 3 - 19 => [] = -5. Given that it is only positive numbers that can be entered, there is no solution.

14. [] + 3 + 13 = 20 => [] = 20 - 3 - 13 => [] = 4

15. 10 - [] + 11 = 14 => [] = 10 + 11 - 14 => [] = 7

16. 18 + [] - 9 = 10 => [] = 10 - 18 + 9 => [] = 1

17. 13 + [] + 5 = 20 => [] = 20 - 13 - 5 => [] = 2

18. [] - 9 + 6 = 11 => [] = 11 + 9 - 6 => [] = 14

19. 3 + [] + 10 = 20 => [] = 20 - 3 - 10 => [] = 7

20. [] + 11 + 3 = 12 => [] = 12 - 11 - 3 => [] = -2. Given that it is only positive numbers that can be entered, there is no solution.

21. 15 + [] - 6 = 11 => [] = 11 - 15 + 6 => [] = 2

22. 13 - [] + 4 = 12 => [] = 13 + 4 - 12 => [] = 5

23. 18 + [] - 9 = 10 => [] = 10 - 18 + 9 => [] = 1

24. 18 - [] + 7 = 15 => [] = 18 + 7 - 15 => [] = 10

25. 20 + [] - 4 = 16 => [] = 16 - 20 + 4 => [] = 0

26. 19 - [] + 1 = 8 => [] = 19 + 1 - 8 => [] = 12

27. 17 + [] - 10 = 10 => [] = 10 - 17 + 10 => [] = 3

28. 10 + [] - 5 = 9 => [] = 9 - 10 + 5 => [] = 4

29. 11 + 7 + [] = 19 => [] = 19 - 11 - 7 => [] = 1

30. 13 - [] + 7 = 20 => [] = 13 + 7 - 20 => [] = 0

31. 18 - [] + 10 = 20 => [] = 18 + 10 - 20 => [] = 8

32. 14 + 3 + [] = 19 => [] = 19 - 14 - 3 => [] = 2

33. 17 - 4 + [] = 13 => [] = 13 - 17 + 4 => [] = 0

34. 5 + [] - 6 = 10 => [] = 10 - 5 + 6 => [] = 11

35. 13 + 4 + [] = 18 => [] = 18 - 13 - 4 => [] = 1

Hope this helps!