bonjour
x + 3 = - 1
⇔ x = - 1 - 3
⇔ x = - 4
3 x - 2 = 2 x + 6
⇔ 3 x - 2 x = 6 + 2
⇔ x = 8
4 x+ 8 = - 3 x + 3
⇔ 4 x + 3 x = 3 - 8
⇔ 7 x = - 5
⇔ x = - 5/ 7
8 x+ 7 = 8 x - 3
⇔ 8 x - 8 x = - 3 - 7
⇔ 0 x = - 10 donc pas de solution
2 x + 6 = x + 8
⇔ 2 x - x = 8 - 6
⇔ x = 2
15 x + 12 = 2 - x + 6
⇔ 15 x + x = 2 + 6 - 12
⇔ 16 x = - 4
⇔ x = - 4/16 = - 1 /4
30 x - 40 = 30 x - 40
30 x - 30 x = - 40 + 40
0 x = 0 ⇔ tout nombre est solution
