bonsoir

a. (x-1)(4-3x)=3x(3-X)

   4 x - 3 x² - 4 + 3 x = 9 x - 3 x²

   - 3 x² + 3 x² + 4 x + 3 x - 9 x = 4

   - 2 x = 4

        x = - 2

b. (2x-3)(x-4)-(2x-3)(5x-1)=0

    ( 2 x - 3 ) ( x - 4 - 5 x + 1 ) = 0

    ( 2 x - 3 ) ( - 4 x - 3 ) = 0

      x = 3/2 ou  - 3/4

d. (x-4)au carré =25

   ( x - 4 )² - 25 = 0

   ( x - 4 - 5 ) ( x - 4 + 5)= 0

( x - 9 ) ( x + 1 ) = 0

 x = 9 ou - 1

3- 2x+8/4 = x-4/6​

36 /12 - 24 x /12 + 24 /12 = 12 x / 12 - 8 /12

- 24 x - 12 x =  - 8 - 36 - 24

- 36 x = - 68

x = 68/36  = 17/9