1: =>-9/3<x<8/5+9/5=17/5
=>-3<x<17/5
=>\(x\in\left\{-2;-1;0;1;2;3\right\}\)
2: =>-8/20<x/20<1/12
=>-24/60<3x/60<5/60
=>-24<3x<5
=>\(3x\in\left\{-21;-18;...;0;3\right\}\)
=>\(x\in\left\{-7;-6;...;0;1\right\}\)
3: -1/3<x/24<-1/4
=>-8/24<x/24<-6/24
=>-8<x<-6
=>x=-7
4: