svp j'ai grave besoin d'aide ou moin un exercice svp​

Bonjour,

Exercice3

1) 9x+5x = -12-2

14x = -14

x= -14/14 = -1

2)

-3 = 9x

x=-3/9 = -1/3

3)

-2 = 3x+11x

-2 = 14x

x= -2/14 = -1/7

4)

9x = 7-4

9x = 3

Exercice 4

1)

7-9x-8 = 5x-6

7-8+6 = 5x+9x

5 = 14x

x= 5/14

2)

6x -48 = 5x-6

6x-5x = -6+48

X = 42

3)

-7x -56 = -8x +7

-7x+8x = 7+56

x = 63

4)

5+4x +2 = -6x +9

4x+ 6x =  9 -5-2

10x= 2

x= 2/1= 1/5