13x+4>1 or 3x+4<-1x>-1 or x<-5/3l3x+4l≤6-6<=3x+4<=6-10/3<=3x<=2-10/9<=x<=2/3解集{x|-1
1所以-6≤3x+4<-1或1<3x+4≤6-10≤3x<-5或-3<3x≤2-10/3≤x<-5/3，-1
