Réponse :
bonjour
4 x + 5 = 8
4 x = 8 - 5 = 3
x = 3 /4
- 12 + 8 x = 1
8 x = 1 + 12 = 13
x = 13/8
5 x + 3 = 12 x - 7
5 x - 12 x = - 7 - 3
- 7 x = - 10
x = 10/7
3 x - 9 = 9 - 4 x
3 x + 4 x = 9 + 9
7 x = 18
x = 18/ 7
6 x + 2 = 14
6 x = 12
x = 2
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