bonsoir
1.3 x - 1/4 = x - 2/5 (tu mets sous dénominateur 20 )
26 x - 5 = 20 x - 8
26 x - 20 x = - 8 + 5
6 x = - 3
x = - 1/2
2.9 - 4 x / 2 = 5 + 2 x/-7 (sous 14)
40.6 - 28 x = 70 - 4 x
- 28 x + 4 x = 70 - 40.6
- 24 x = 29.4
- x = 1.225
x = - 1.225
3.3 x - 4/7 + 8 = 4 x - 2
23.1 x - 4 + 56 = 28 x - 14
23.1 x - 28 x = - 14 + 4 - 56
- 4.9 x = - 66
x = 660/490 = 66/49
