a) 2(x-1)<-6=
2x-2<-6
2x<-6+2
2x<-4
x<-4:2
x<-2
x €[-3,-4,-5.......-n]
b)3(x+1)<-18
3x+3<-18
3x<-18-3
3x<-21
x<-21:3
x<-7
x€[-8,-9,-10......-n]
