Réponse :

Explications étape par étape

Bonjour

Résoudre :

x - 7 = 4

x - 7 + 7 = 4 + 7

x = 11

2x = 13

2x/2 = 13/2

x = 13/2

x = 6,5

9 - x = 5

9 - x + x = 5 + x

9 - 5 = 5 + x - 5

4 = x

x = 4

4x = 0

4x/4 = 0/4

x = 0

Exercice 47 :

Résoudre :

3x + 5 = 4x - 7

3x + 5 - 3x = 4x - 7 - 3x

5 + 7 = x - 7 + 7

12 = x

x = 12

2x - 9 = 8x + 3

8x - 2x = -9 - 3

6x = -12

x = -12/6

x = -2

-2x + 3 = 3x - 1

3x + 2x = 3 + 1

5x = 4

x = 4/5

5 - 2x = x

x + 2x = 5

3x = 5

x = 5/3

1 + 3x/10 = 4 - 2x/5

3x/10 + 2x/5 = 4 - 1

3x/10 + 4x/10 = 3

7x/10 = 3

x = 3 * 10/7

x = 30/7

x^7 + 3x - 2 = 7x + 4 + x^7

x^7 - x^7 - 2 = 4 + 7x - 3x

-2 - 4 = 4x

4x = -6

x = -6/4

x = -3/2