Bonjour
Résoudre les équations :
a. 4 (x + 5) = 10x + 3
4x + 20 = 10x + 3
4x - 10x = 3 - 20
- 6x = - 17
x = 17/6
b. 3 (x - 2) = 6 (x + 4)
3x - 6 = 6x + 24
3x - 6x = 24 + 6
- 3x = 30
x = - 30/3
x = - 10
c. 7x - (5x + 3) = 5 (x - 3) + 2
7x - 5x - 3 = 5x - 15 + 2
7x - 5x - 5x = - 15 - 3 + 2
- 3x = - 16
x = 16/3
d. 7 (n + 2) - 3 = 25 - (3n + 4)
7n + 14 - 3 = 25 - 3n - 4
7n + 3n = 25 - 4 - 14 + 3
10n = 10
n = 10/10
n = 1.
e. 4y + 3 (4y - 2) = 3 (y + 1)
4y + 12y - 6 = 3y + 3
4y + 12y - 3y = 3 + 6
13y = 9
y = 9/13.
