Bonjour,
1)
7x - 6 = 4 - 3x
7x + 3x = 4 + 6
10x = 10
x = 10/10
x = 1
2)
7/3x + 5 = 7 - 5/3x
7/3x + 5/3x = 7 - 5
12/3x = 2
4x = 2
x = 2/4
x = 1/2
3)
1/3x + 6 = 4/3 - 2x
1/3x + 2x = 4/3 - 6
1/3x + 6/3x = 4/3 - 18/3
x + 6x = 4 - 18
7x = - 14
x = - 14/7
x = - 2
4)
3 (- 4x + 8) + 3x - 4 (2x - 5) = 4x
- 12x + 24 + 3x - 8x + 20 = 4x
- 12x + 3x - 8x - 4x = - 24 - 20
- 21x = - 44
x = 44/21
5)
- 6 (- x + 5) + 7 (3x + 1) = - 5 (x - 2)
6x - 30 + 21x + 7 = - 5x + 10
6x + 21x + 5x = 10 + 30 - 7
32x = 33
x = 33/32
x = 1,03125
