Bonjour,
Trouver x sachant que :
-7 = -2 - 5x
-7 + 2 = -2 - 5x + 2
-5 = -5x
-5x = -5
-5x/-5 = -5/-5
x = 1
bonjour
- 7 = - 2 - 5 x
5 x = - 2 + 7
5 x = 5
