The document contains a series of mathematical equations with less than, greater than, and equal signs. The equations become increasingly simplified through a process of elimination and reduction.

4. 84+ 5
13 14

5. 84+ 5
13 14

6. 7+7
13 14

7. 8+6
13 14

9. 3 17
81 16
15 28
72 = 69 32 = 16
4 = 7 8 = 7
17 = 34 4 = 32

10. 17
81 16
15 28
72 3 = 69 32 = 16
4 = 77 8 = 7
17 = 34 4 = 12

11. 17
16
15 28
72 3 = 69 32 = 16
81 4 = 77 8 = 7
17 = 34 4 = 32

12. 16
16 28
72 3 = 69 32 = 16
81 4 = 77 8 = 7
17 17 = 34 4 = 32

13. 15 28
72 3 = 69 32 16 = 16
81 4 = 77 8 = 7
17 17 = 34 4 = 32

14. 28
72 3 = 69 32 16 = 16
81 4 = 77 15 8 = 7
17 17 = 34 4 = 32

16. < = >
18+12>25

17. < = >
18+12>25
25+9< 43

18. < = >
18+12>25
25+9<43
54+6<74

19. < = >
18+12>25
25+9<43
54+6<74
28+14<65

20. < = >
18+12>25 15-9>5
25+9<43 35-19>12
54+6<74
28+14<65