aider moi c des équation juste la 5 et la 7 merci

Bonjour,

5)

x/2 + (x + 6) / 3 = 7/6

3x/6 + (2x + 12) / 6 = 7/6

3x + 2x + 12 = 7

3x + 2x = 7 - 12

5x = - 5

x = - 5/5

x = - 1

7)

4 (x - 6) + 2x = 15

4x - 24 + 2x = 15

4x + 2x = 15 + 24

6x = 39

x = 39/6

x = 13/2.

Bonjour,

Résoudre:

3x/6+2x/6+12/6= 7/6

5x/6+12/6= 7/6

5x + 12 = + 7

5x = 7 − 12

5x = -5

x = -1

S= {-1 }

6x= 12+2

x= 14/6

x= 7/3

S= { 7/3 }