Bonjour,
Résoudre les équations suivantes :
a) 13x + 7 = 2x - 4
13x - 2x = - 4 - 7
11x = - 11
x = - 11/11
x = - 1
b) -3x + 11 = 4x - 17
- 3x - 4x = - 17 - 11
- 7x = - 28
x = 28/7
x = 4
c) 8x - (5 - 4x) = 2 (x - 5)
8x - 5 + 4x = 2x - 10
8x + 4x - 2x = - 10 + 5
10x = - 5
x = - 5/10
x = - 1/2.