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4x + 8 = 12

4x = 12 - 8

4x = 4

x = 4/4

x = 1

4x - 5 = 3x - 4

4x - 3x = - 4 + 5

x = 1

x + 1 = 5x + 21

x - 5x = 21 - 1

- 4x = 20

x = - 20/4

x = - 5

6x - 9 = 10x + 11

6x + 10x = 11 + 9

16x = 20

x = 20/16

x = 5/4

8x - 4 = x - 3

8x - x = - 3 + 4

7x = 1

x = 1/7

- 3x - 5 = - x - 7

- 3x + x = - 7 + 5

- 2x = - 2

x = 2/2

x = 1.