Bonjours pourriez vous m'aidez svp

7x = 28
x = 28/7
x = 4


7 + x = 28
x = 28 - 7
x = 21

-7x = -28
x = -28/(-7)
x = 4

7x = -28
x = -28/7
x = -4

7-x = 28
-1x = 28 - 7
-1x = 21
x = 21/(-1)
x = -21

x - 7 = -28
x = -28 + 7
x = -21

7 + x = -28
x = -28 - 7
x = -35

x - 7 = -28
x = -28 + 7
x = -21

-7x = 28
x = 28/(-7)
x = -4

7 - x = 28
-1x = 28 - 7
-1x = 21
x = 21/(-1)
x = -21

bonjour

7 x = 28
x = 4

x - 7 = - 28
x = - 28 + 7
x = - 15

7 + x = 28
x = 28 - 7
x = 15

x - 7 = 28
x = 28 + 7 
 x = 35

7 x = - 28
x = - 28/7 = - 4

- 7 x = 28
x = - 28/7 = - 4