Bonsoir j'ai problème de résolution d'équation niveau seconde : A. 7x+9=7(x+1)+2 B. 5x-[1-(3x-2)]=8(x+1) C. xV3+6=3xV3-5 D. -2/5 x=2/-3 (Les V sont des racines

A = 7x +9 = 7 (x+1)+2

    = 7x +9 = 7x +7 +2

    7x -7x = -9 +7+2

      0x = -1

         x = -1/0

         x =-1

B. 5x - [1-(3x - 2)] = 8(x+1)

     5x -1 -3x +2 = 8x +8

      5x -3x -8x = 8 +1 -2

       5x - 11x = 9-2

        -6x = 7

           x = -7/6

c. xV3 +6 = 3xV3-5

   xV3-3xV3 = -5-6

   -2xV3 = -11

    -2x = - 11/V3

       x  = -11/V3/-2

D -2/5 x = 2/-3

  x = 2/-3 /-2/5

 x = 2/3 x 5/-2

x = 10 /-6

x = 2x 5 / 2x (-3)

 x = 5/-3