bonjour

a) 2(-3x + 2) = 5x +8

   - 6 x + 4 = 5 x + 8

   - 6 x - 5 x = 8 - 4

   - 11 x = 4

         x = - 4/11

b) (x+3)(4-x) = (x-4)(-x+7)

    4 x - x² + 12 - 3 x = - x² + 7 x + 4 x - 28

     - x² + x² + x -  11 x = - 28 - 12

    - 10 x = - 40

      x = 4

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

    3 x + 5 = 2 x - 10

    3 x - 2 x = - 10 - 5

    x = - 15

d)-4(3+x)-2(x-3)=0

    x = - 3 ou 3

Verified answer

Bonjour;

a) 2(-3x + 2) = 5x +8;

-6x+4 =5x+8

4-8= 5x + 6x

-4= 11x

x = -4/11

b) (x+3)(4-x) = (x-4)(-x+7)

4 x -x² +12-3x = -x² +7x +4x -28

4x -x² -3x +x² -7x +4x = -28-12

- 2x = -40

x = -40/-2

x = 40/2

x =20

c) 3x + 5 = 2(x-5);

3x +5 = 2x -10

3x-2x = -10-5

x = -15

d)-4(3+x)-2(x-3)=0

-12 -4x -2x +6 =0

-6x -6 = 0

-6x = 6

x = 6/-6

x = -1