Réponse :
10 - 9 x = 15 x + 13 ⇔ 10 - 13 = 15 x + 9 x ⇔ - 3 = 24 x ⇔ x = - 3/24 = - 1/8
7(x - 3) = 5 x + 1 ⇔ 7 x - 21 = 5 x + 1 ⇔ 7 x - 5 x = 1 + 21 ⇔ 2 x = 22
⇔ x = 22/2 = 11
2(x + 5) = 8(3 - x) ⇔ 2 x + 10 = 24 - 8 x ⇔ 2 x + 8 x = 24 - 10
⇔ 10 x = 14 ⇔ x = 14/10 = 7/5
Explications étape par étape
