Răspunsuri

2014-06-18T11:03:21+03:00
7x-x<-30      6x<-30    x<30/6       x<-5
2014-06-18T11:15:35+03:00
7x+30<x
7x-x<-30
6x<-30
x<-30/6
x<-5
x apartine {-inf, -5)