bonjour
- 5 x + 3 = 12 - 8 x
- 5 x + 8 x = 12 - 3
3 x = 9
x = 9/3 = 3
3 x + 3 = 4 x - 4 + 5
3 x - 4 x = - 4 + 5 - 3
- x = - 2
x = 2
x /4 = 5 /2
2 x = 20
x = 10
3 - ( x - 2 ) /4 = 1/3 - ( 2 x + 1 ) / 6
36/12 - ( 3 x - 6 ) /12 = 4/12 - ( 4 x + 2 ) /12
- 3 x + 6 + 36 = 4 - 4 x - 2
- 3 x + 4 x = 4 - 2 - 6 - 36
x = - 40
fais le dernier, tu mets sous dénominateur 10
