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a) 4 (2 - x) + 5 = - 3 * 2x - 12

8 - 4x + 5 = - 6x - 12

- 4x + 6x = - 12 - 8 - 5

2x = - 25

x = - 25/2

x = - 12,5

b) x - (2x + 1) = 4 (x + 3)

x - 2x - 1 = 4x + 12

x - 2x - 4x = 12 + 1

- 5x = 13

x = - 13/5

c) (5x + 2) * 3 + 1 = x

15x + 6 + 1 = x

15x - x = - 1 - 6

14x = - 7

x = - 7/14

x = - 1/2

d) 4 (x - 5) = 6 (- x + 2)

4x - 20 = - 6x + 12

4x + 6x = 12 + 20

10x = 32

x = 32/10

x = 3,2

e) (3x + 1) / 4 = (5x - 2) / 5

15x + 5 = 20x - 8

15x - 20x = - 8 - 5

- 5x = - 13

x = 13/5

f) (4 + x) / 8 = (2x - 9) / 3

12 + 3x = 16x - 72

3x - 16x = - 72 - 12

- 13x = - 60

x = 60/13.