bonjour
2.5 x +6 = 5 x - 2.1
2.5 x - 5 x = - 2.1 - 6
- 2.5 x = - 8.1
x = 3.24
5.4 - 2 y = 1
- 2 y = 1 - 5.4
- 2.y = - 4.4
y = 2.2
1.4 - 0.5 x = 0.4 + 5.5 x
- 0.5 x - 5.5 x = 0.4 - 1.4
- 6 x = - 1
x = 1/6 = non décimal
3 t - 5 = - 2 t + 1.5
3 t + 2 t = 1.5 + 5
5 t = 6.5
t = 1.3