Bonjour quelqu’un peut m’aider à résoudre les équation merci

Bonjour,

1) 5x + 7 = -5 + 11x

5x + 7 - 7 = -5 + 11x -7

5x = -11 + 11x

5x - 11x = -11 + 11x - 11x

-6x = -11

x = -11/-6 ≈ 1.8

2) 3x - 4 = 2x + 9

3x - 4 + 4 = 2x + 9 + 4

3x = 2x + 13

3x - 2x = 2x - 2x + 13

x = 13

3). 2(5-3x) = 6(2x + 1)

10 - 6x = 3x + 6

10 - 10 - 6x = 3x + 6 - 10

-6x = 3x -4

-6x - 3x = 3x - 3x -4

-9x = -4

x = -4/-9 ≈ 0.4

4). 2x + 1 = 4(x-2) + x

2x + 1 = 4x - 8

2x + 1 - 1 = 4x - 8 + 1

2x = 4x -7

2x - 4x = 4x - 4x - 7

-2x = -7

X = -7/-2 = 3.5