bonjour
10 x + 8 = 7 x + 29
10 x - 7 x = 29 - 8
3 x = 21
x = 7
10*7 + 8 = 7 *7 + 29
78 = 78
5 x + 1 = 2 x + 11
5 x - 2 x = 11 - 1
3 x = 10
x = 10/3
5*10/3 + 1 = 2 *10/3 + 11
50/3 + 3 /3 = 20/3 + 33 /3
53/3 = 53/3
18 x - 5 = 2 x + 43
18 x - 2 x = 43 + 5
16 x = 48
x = 3
18*3 - 5 = 2 *3 + 43
49 = 49
bonne journée
