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Bonjour,

5x + 7 = 9x - 11

5x - 9x = - 11 - 7

- 4x = - 18

x = 18/4

x = 9/2

(4x + 7) + (2x + 3) = 0

4x + 7 + 2x + 3 = 0

4x + 2x = - 7 - 3

6x = - 10

x = - 10/6

x = - 5/3

8 (1 + 7x) = 3 (5 - 2x)

8 + 56x = 15 - 6x

56x + 6x = 15 - 8

62x = 7

x = 7/62

(3 - 7x) / 9 - (2x - 1) / 3 = (5x + 12) / 18

(6 - 14x) / 18 - (12x - 6) / 3 = (5x + 12) / 18

6 - 14x - 12x - 6 = 5x + 12

- 14x - 12x - 5x = 12

- 31x = 12

x = - 12/31

(4x + 7) (2x + 3) = 0

4x + 7 = 0                 ou               2x + 3 = 0

4x = - 7                                        2x = - 3

x = - 7/4                                       x = - 3/2.