-1.8/2,7x-13.5<0
-1.9/6.3-3x > 0
-3/1.6x-9.6> 0

1)-1.8/2,7x-13.5<0
-1.8/2,7x<13.5
-1.8х<36.45
х<-20,25
2)-1.9/6.3-3x > 0
-1.9/6.3>3х
-1.9>18.9х
х>0,1
3)-3/1.6x-9.6> 0
-3/1.6x>9.6
-3х>15.36
х<-5.12