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Bonjour, pouvez vous m’expliquez comment résoudre ces équations, merci d’avance
7-3x=-8
9x-4=5x+8
5(2x+4)=7


Répondre :

Bonjour,

7-3x=-8

- 3x = - 8 - 7

- 3x = - 15

x = 15/3

x = 5

9x-4=5x+8

9x - 5x = 8 + 4

4x = 12

x = 12/4

x = 3.

5(2x+4)=7

10x + 20 = 7

10x = 7 - 20

10x = - 13

x = - 13/10.

x = - 1,3.

Bonjour,

7 - 3x = - 8

7 + 8 = 3x

15 = 3x

15/3 = x

5 = x

9x - 4 = 5x + 8

9x - 5x = 8 + 4

4x = 12

x = 12/4 = 3

5(2x + 4) = 7

10x + 20 = 7

10x = 7 - 20

10x = -13

x = -13/10 = - 1,3