Répondre :
a. x+3<2x-1
3+1<2x-x
4<x
b. 5x+9<3x+4
5x-3x<4-9
2x<-5
x<(-5/2)
c. 3x-5>8x+3
3x-8x>3+5
-5x>8
x<(-8/5)
d. 7x>x-8
7x-x>-8
6x>-8
x>(-4/3)
3+1<2x-x
4<x
b. 5x+9<3x+4
5x-3x<4-9
2x<-5
x<(-5/2)
c. 3x-5>8x+3
3x-8x>3+5
-5x>8
x<(-8/5)
d. 7x>x-8
7x-x>-8
6x>-8
x>(-4/3)