Bonjour voila j ai 3 equation a resoudre pouvais vous m aider svp 2x-5=4(3x-2)-(2x-5) 1sur3x+3=2x-1 2x-1sur 3-x-1 sur 3= 3x+7 sur 12 Merci

Bonjour,

2x - 5 = 4 (3x - 2) - (2x - 5)

2x - 5 = 12x - 8 - 2x + 5

2x - 12x + 2x = - 8 + 5 + 5

- 8x = 2

x = - 2/8

x = - 1/4

1/3x + 3 = 2x - 1

1/3x - 2x = - 1 - 3

1/3x - 6/3x = - 3/3 - 9/3

x - 6x = - 3 - 9

- 7x = - 12

x = 12/7

2x - 1/3 - x - 1/3 = 3x + 7/12

2x - x - 3x = 7/12 + 1/3 + 1/3

- 2x = 7/12 + 4/12 + 4/12

- 2x = 15/12

- 24/12x = 15/12

- 24x = 15

x = - 15/24

x = - 5/8