Réponse :
bonsoir
5 x /7 + 4 = - 4 x /3 + 1
15 x / 21 + 84/21 = 28 x / 21 + 21 /21
15 x - 28 x = 21 - 84
- 13 x = - 63
x = 63/13
11 x /3 - 6/7 = 2 x
77 x /21 - 18/21 = 42 x /21
77 x - 42 x = 18
35 x = 18
x = 18/35
- 4 x /9 + 1 = 1 /8
- 4 x / 9 = 1 / 8 - 1
- 32 x /72 = 9/72 - 72/72
- 32 x = - 63
x = 63/32
fais le dernier