bonjour
5 - 2 a = 12
- 2 a = 12 - 5
- 2 a = 7
a = - 7/2
Réponse :
bonjour,
on resout l'equation :
5 - 2a = 12
-2a = 12 - 5
-2a = 7
a = 7/-2
a = -7/2
a = -3.5
voila:)
