6. Résoudre ces équations : a. 10x = 8 + 6x b. 5x = 9-7x c. 6-3x = 12x d. 7x-3 = 11 e. 8 + 13x = -18 f. 3x = 2x+5

Réponse :

bonjour

a. 10x = 8 + 6x

    10 x - 6 x = 8

      4 x = 8

       x = 8/4 = 2

b. 5x = 9-7x

   5 x + 7 x = 9

   12 x = 9

       x = 9/12 = 3 /4

c. 6-3x = 12x

  - 3 x - 12 x = - 6

  - 15 x = - 6

          x = 6/15

d. 7x-3 = 11

   7 x = 11 + 3

   7 x = 14

      x = 2

e. 8 + 13x = -18

   13 x = - 18 - 8

    13 x = - 26

      x = - 2

f. 3x = 2x+5

  3 x - 2 x = 5

   x = 5

Explications étape par étape :

Explications étape par étape:

Hello !

a. 10x - 6x = 8

4x = 8

x = 8/4 = 2

b. 5x = 9 - 7x

7x + 5x = 9

12x = 9

x = 9/12 = 3/4

c. 6 - 3x = 12x

15x = 6

x = 3/5

d. 7x - 3 = 11

7x = 11 + 3

x = 14/7 = 2

e. 8 + 13x = -18

-13x = 26

-x = 26/13

x = 2

f. 3x = 2x + 5

3x - 2x = 5

x = 5