1. 8-z = 12
2. y-4 = 6
3. x+2 = 5
4. 2x-3 = 5
5. 10x-x = 12
6. 5x+7 = 8
7. 9x-6 = 18
8. 5x+7 = 3
9. 2-7z = 18
10. 1-4w = 9
11. 8x-6 = 6x+4
12. 12+7x = 2x+22
13. 9-8y = 27-2y
14. 3w-3 = 4w+11
15. 2z + 9 = z+1
16. 11y-5y+6 = 24-9y
17. 21x-3 = 3x+6
18. 10x+21 = 15-2x
19. -9x+9-12x = 4x-13-5x
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