Répondre :
1) 6x + 11 = 89
6x + 11 - 11 = 89 -11
6x = 78
x = 78/6 = 13
2) 7x - 9 = 14
7x - 9 + 9 =14 + 9
7x = 23
x = 23/7 = 3.3
6x + 11 - 11 = 89 -11
6x = 78
x = 78/6 = 13
2) 7x - 9 = 14
7x - 9 + 9 =14 + 9
7x = 23
x = 23/7 = 3.3