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2 x = - 2 x + 8

2 x + 2 x = 8

4 x = 8

x = 8/4 = 2

4 x - 8 = 7 x + 4

4 x - 7 x = 4 + 8

- 3 x = 12

x = - 4

3 x + 5 = 6 x - 9

3 x - 6 x = - 9 - 5

- 3 x = - 14

x = 14/3

Réponse:

a) 2x = -2x + 8

2x + 2x = 8

4x = 8

x = 8/ 4 = 2

b) 4x - 8 = 7x + 4

-8 - 4 = 7x - 4x

-4 = 3x

-4/3 = x

x = - 1,3333....

c) 3x + 5 = 6x - 9

9 + 5 = 6x - 3x

14 = 3x

x = 14/3 = 4,6666....