bonjour
1 ) 8 - 4 x + 5 = - 6 x - 9 - 12
- 4 x + 6 x = - 9 - 12 - 8 - 5
2 x = - 34
x = - 17
2) 3 x + 1/4 = 5 x - 2 /5
3 x - 5 x = - 2/5 - 1 /4
60 x /20 - 20 x /20 = - 8/20 - 5/20
40 x = - 13
x = - 13/40
3 ) x /3 + 5/6 = 1 /2 - x
2 x /6 + 6 x /6 = 3/6 - 5/6
8 x = - 2
x = - 2/8 = - 1/4
4 ) x - x - 1 = x + 3 - x + 3
x - x - x + x = 3 + 3 + 1
0 x = 7 pas de solution
