Vreau si eu rezolvarea!
))

-1<=x+2<=1 |-2
-3<=x<=-1
deci x apartine [-3,-1] deci A are 3 elemente intregi.
-1<(5+3x)/2<1 |*2
-2<5+3x<2 |-5
-7<3x<-3 |:3
-7/3<x<-1
deci x apartine de (-7/3,-1) deci B nu are niciun element natural