Bonjour,
1) 4x+2=x+11
4x-x = 11 -2
3x = 9
x= 9/3
x= 3
2) 3x-7=2x-9
3x-2x = -9 +7
x = -2
3) 5x-1=7x-1
-1+1 = 7x -5x
0 = 2x
x= 0
Bonjour,
Résoudre les équations :
1.
4x + 2 = x + 11
4x + 2 - x = x + 11 - x
3x + 2 = 1
3x + 2 - 2 = 11 - 2
3x = 9
x = 3 ✅
2.
3x - 7 = 2x - 9
3x - 7 + 7 = 2x - 9 + 7
3x = 2x - 2
3x - 2x = 2x - 2 - 2x
x = -2 ✅
3.
5x - 1 = 7x - 1
5x - 1 + 1 = 7x - 1 + 1
5x = 7x
5x - 7x = 7x - 7x
-2x = 0
2x = 0
x = 0/2 = 0 ✅
Bonne journée