21. 7y-10+2y-8 = 14y-9+8y
22. 5y+6y-81 = 7y+102+65y
23. 16+7x-5+x = 11x-3-2x
24. -12x-8-3x+10 = 2x-9+6x
25. 3z-8+6z-12 = z-10+9z-13
26. x-6-5x+10x = 9x-8+3x
27. 9z-1-14z+8 = z-9+15z-1
28. x-7-12x-9+3x = 14x-10-x+7
29. 2z-4-8z+9 = 10z-6+z-12
30. 10z-5+7z-10+8z = 2z-6+4z-8
31. 3x+101-4x-33 = 108-16x-100
32. 14-12x+39x-18x = 239-60x-6x
33. -8x+48-30x-51x = 3x-31x+170
34. 7x+5-2x+9x = 14x-9+2x-11x+8
35. 6z-12z-18-5z = 12z+4z-11+z
36. 10n-8+3n-7+n = 20n-10-6n
37. 3z+5-7z+9z-11z+13 = 16-8z
38. 5x-8-8x+10-3x = 9-x+6-5x-13
39. 12y-9-10y+3-8y = y-9+3y+10-10y
40. 2x+7-8x+5-3x = 14-6x-2-3x
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