bonsoir je suis en classe de 2nd et je ne comprends pas cet exercice pourriez-vous m’aider ? merci d’avance ;)

Bonsoir,

1.

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

⇔ 4 - 15x - 10 + x - 5 = 0

⇔ -11 - 14x = 0

⇔ x = -11/14

2.

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

⇔ 5x = 7 + 6x + 3

⇔ 6x - 5x = -10

⇔ x = -10

3.

4 (-2x - 6) + 3x = 8

⇔ -8x - 24 + 3x = 8

⇔ 5x = -32

⇔ x = -32/5

4.

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

⇔ 2x - 10 = 12x + 6

⇔ 10x = -16

⇔ x = -16/10 = -8/5

5.

6 (2x -4) - 3 (6x+7) = 5

⇔ 12x - 24 -18x - 21 = 5

⇔ 6x = -50

⇔ x = 25/3

6.

4 (3x-6) = 5 + 2 (7x+3)

⇔ 12x - 24 = 5 + 14x + 6

⇔ 2x = -35

⇔ x = -35/2