Bonjour, svp aidez moi ! C'est des équations Merci d'avance je met meilleur réponse :)

1) 4x-8 = 0

4x = 8

x = 8/4 = 2

2) 6+2x = 13x-7

6+7 = 13x-2x

13 = 11x

x = 13/11

3) 8+3x-5-x = 7x+13

8-5-13 = 7x+x-3x

-10 = 5x

x = -10/5 = -2

4) -x+1 = 1

-x = 1-1

x = 0

5) -3x = 0

x = 0/(-3) = 0

6) (5/7)x = 15/4

x = (15/4) / (5/7)

= (15/4) * (7/5)

= 5.25

7) (-1/2)x = 2

x = 2/(-1/2) = -4

8) 3x+1 = 4x+5-4-x

3x-4x+x = 5-4-1

0 = 0

S = ]-∞;+∞[

9) 9x - 3(4-5x) = 7x - 2(3-9x)

9x - 12 + 15x = 7x - 6 + 18x

9x + 15x - 7x - 18x = -6 + 12

-x = 6

x = -6

10) 3(x-2) - 4(x+5) = 10(x+4)

3x - 6 - 4x - 20 = 10x + 40

3x - 4x - 10x = 40 + 6 + 20

-11x = 66

x = 66/(-11) = -6

11) 5x - [3x - (2+4x) - 1 + 6x] = 3x

5x - (3x - 2 - 4x - 1 + 6x) = 3x

5x - 3x + 2 + 4x + 1 - 6x = 3x

5x - 3x + 4x - 6x - 3x = -2 - 1

-3x = -3

x = -3/(-3) = 1

12) 8x - 2 [1 - (3x-3)] = 9 - 9 [x + (1-x)]

8x - 2(x - 3x + 3) = 9 - 9(x + 1 - x)

8x - 2x + 6x - 6 = 9 - 9x - 9 + 9x

8x - 2x + 6x + 9x - 9x = 9 - 9 + 6

12x = 6

x = 6/12 = 0.5

13) 8x² - 24x + 18 = 32 + 4(2x² -  1)

8x² - 24x + 18 = 32 + 8x² - 4

8x² - 8x² - 24x = 32 - 4 - 18

-24x = 10

x = 10/(-24) = -5/12

14) [2(x+1)]/5 = x - 4

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

2x + 2 = 5x - 20

2x - 5x = -20 - 2

-3x = -22

x = -22/(-3) = 22/3

Je n'ai pas le temps de faire la suite maintenant, j'éditerai mon message dans la soirée