bonjour
a) 3x + 5 = 4x - 7
3 x - 4 x = - 7 - 5
- x = - 12
x = 12
b) 2x - 9= 8x + 3
2 x - 8 x = 3 + 9
- 6 x = 12
x = - 2
c)-2x + 3 = 3x - 1
- 2 x - 3 x = - 1 - 3
- 5 x = - 4
x = 4/5
d) 5 - 2x= x
- 2 x - x = - 5
- 3 x = - 5
x = 5/3
e) 1+ 3/10 x = 4-2/5 x
3 x /10 + 2 x /5 = 4 - 1
3 x /10 + 4 x /10 = 40/10 - 10/10
7 x = 30
x = 30/7
f) x3 + 3x-2= 7x+ 4+X
x³ ?
