10. If 2x + 4x = 3, then 6x = 3
11. If x= m and 3x = 2, then 3m = 2
12. If x=(y-z), then 3x = y − z
13. If y-1 = 3y - 6y, then y - 1 = -3y
14. If a = 2b, then 2b = a
15. If n + 3 = 0, then n = -3
t+3
16. If = 2, then t + 3 = 8
4
17. If 7z = 21, then 7z + 4 = 21 +4
18. If 6y= 42, then y = 7
19. If -2x-y, then -2(x + y)
20. If 8m = 5n and 3x = 8m, then 5n = 3x