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-3>3x<-3
-1>x<-1
Rpta: <-∞,-1>
2. 4≥3x+5/2<3
8≥3x+5<6
3≥3x<1
1≥x<1/3
Rpta: <-∞,1/3>
3. 9≤2(x+7)≥3
9≤2x+14≥3
-5≤2x≥-11
-5/2≤x≥-11/2
Rpta: [-5/2,+∞>
4. 5≥7x+5>3
0≥7x>-2
0≥x≥-2/7
Rpta: <-2/7,0]