Bonjour vous pouvez m’aider h) -6x + 1 = x - 13 I) 2,5x+2=4,3x

bonjour

10 x = 7

x = 7/10

11 x - 6 = 7 x + 9

11 x - 7 x = 9 + 6

4 x = 15

x = 15/4

- 6 x + 1 = x - 13

- 6 x - x = - 13 - 1

- 7 x = - 14

x = 2

2.5 x + 2 = 4.3 x

2.5 x - 4.3 x = - 2

- 1.8 x = - 2

x =  20/18 = 10/9

Réponse :

h) -6x + 1 = x - 13

=> -6x + 1 + 13 + 6x = x - 13 + 6x + 13

=> 14 = 7x

=> 7x = 14

Donc, x = 2

____________

l) 2,5x + 2 = 4,3x

=> 2,5x - 4,3x + 2 - 2 = 4,3x - 2  - 4,3x

=> -1.8x = -2

=> x = -2 / -1.8 = 2/1.8

Donc, x = 20/18 = 10/9