bonjour

7 x - 4 = 5 x + 6

7 x - 5 x = 6 + 4

2 x = 10

x = 10/2  = 5

3 - 2 x = - 9 + 3 x

- 2 x - 3 x = - 9 - 3

- 5 x = - 12

x = 12/5

4.3 x + 12 = 33 - 5.7 x

4.3 x + 5.7 x = 33 - 12

10 x = 11

x = 11/10   = 1.1

3 x - 2 x + 8  = 5 + 4 - 8 x

x + 8 x = 9 - 8

9 x =  1

x = 1/9