bonjour
7 x = 78
x = 78/7
3 x = 2
x = 2/3
x - 13 = 8
x = 8 + 13
x = 21
5 x - 2 = 12
5 x = 12 + 2
5 x = 14
x = 14/5
1 - 3 x = 7
- 3 x = 7 - 1
- 3 x = 6
x = - 2
1 - 3 x = 7 x + 12
- 3 x - 7 x = 12 - 1
- 10 x = 11
x = - 11/10
4 x - 1 = 2 - x
4 x+ x = 2 + 1
5 x = 3
x = 3 /5
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bonjour
7 x = 78
x = 78/7
3 x = 2
x = 2/3
x - 13 = 8
x = 8 + 13
x = 21
5 x - 2 = 12
5 x = 12 + 2
5 x = 14
x = 14/5
1 - 3 x = 7
- 3 x = 7 - 1
- 3 x = 6
x = - 2
1 - 3 x = 7 x + 12
- 3 x - 7 x = 12 - 1
- 10 x = 11
x = - 11/10
4 x - 1 = 2 - x
4 x+ x = 2 + 1
5 x = 3
x = 3 /5