Bonjour
Résoudre les équations suivantes en détaillant.
a) 3x + 5 = 0
3x = - 5
x = - 5/3
b) 7 = -2 X-6
- 2x = 7 + 6
- 2x = 13
x = - 13/2
c) 3 ( a -1) + 4 = 2
3a - 3 + 4 = 2
3a = 2 + 3 - 4
3a = 1
a = 1/3
d) 4x – 5 = 7x + 1
4x - 7x = 5 + 1
- 3x = 6
x = - 6/3
x = - 2
e) 10-2x = 5x - 1
- 2x - 5x = - 1 - 10
- 7x = - 11
x = 11/7
f) 6 (y + 7) = 7 - y
6y + 42 = 7 - y
6y + y = 7 - 42
7y = - 35
y = - 35/7
y = - 5.
