Réponse :
Explications étape par étape
Bonjour
n = 5
7n = 12
7n = 7 x 5 = 35
[tex]35 \ne 12[/tex] ❌
2n + 7 = n + 12
2n + 7 = 2 x 5 + 7 = 10 + 7 = 17
n + 12 = 5 + 12 = 17
17 = 17 ✅
0,6n = n - 2
0,6n = 0,6 x 5 = 3
n - 2 = 5 - 2 = 3
3 = 3 ✅
10(n - 3) = 5(n - 1)
10(n - 3) = 10(5 - 3) = 10 x 2 = 20
5(n - 1) = 5(5 - 1) = 5 x 4 = 20
20 = 20 ✅
