bonjour
a= 3 x /4 = 5
3 x = 20
x = 20/3
b ) 4 x - 3 = 11
4 x = 11 + 3
4 x= 14
x = 14/4 = 7 /2
c) 7 - 8 x = 56
- 8 x = 56 - 7
- 8 x = 49
x = - 49/8
d) 6 x - 4 = 3 x + 14
6 x - 3 x = 14 + 4
3 x = 18
x = 6
