Question 684767
|(3x+1)| < (x-11)
3x+1<(x-11);3x+1<-(x-11)
3x+1-1<x-11-1
3x<x-12:
3x-x<x-x-12
2x<-12
dividing 2 on both sides
x<-6
now for 3x+1<-(x-11)
3x+1<-x+11
3x<-x+11-1
3x+x<10
4x<10
dividing 4 on both sides
x<10/4
x<5/2