Bonjour,

x/4  =9

x = 9*4 = 36

3x-11 = 9x+4

-11-4 = 9x-3x

-15 = 6x

x= -15/6  = -2,5

5x+5 = 4x-7

5x-4x = -7-5

x = -12

5x-15 = -2x -13

5x+2x+ -13 +15

7x = 2

x=  2/7 =0,2857...

x-2 = -2x +4

2x+x=  4+2

3x= 6

x= 6/3 = 2

4x+15 = 2x+3

4x-2x  = 3-15

2x = -12

x= -12/2 = -6

-12<-6 < -2,5 <0,28 < 2 < 36

MDEIAN