Question

-18<3x-7<-6

Answer 1

this question is asking for the solution. {x|x<x< -11/3, 1,3} is what i think it is

Answer 2

-18<3x-7<-6 , add 7
-11 < 3x < 1 , now divide by 3
-11/3 < x < 1/3

now write it as
{x│ -11/3 < x < 1/3 }