Bonjour
Résoudre les équations suivantes :
a. 4 + r = -7
r = - 7 - 4
r = - 11
b. 6 - r = 13
- r = 13 - 6
- r = - 7
r = 7
c. 4.r - 2 = 10
4r = 10 + 2
4r = 12
r = 12/4
r = 3
d. 5.r + 2 = 8r - 3
5r - 8r = - 3 - 2
- 3r = - 5
r = 5/3
e. 2(36 + 7) = 4(-2b + 1)
72 + 14 = - 8b + 4
8b = - 4 + 72 + 14
8b = 62
b = 62/8
b = 31/4.
