In this question , we have to solve the given inequality question.
When removing the absolute sign , we will get a compound inequality which is
-12<3x+6<12
Now whatever we do in the middle, we have to do to both sides.
First we get rid of 6, and for that, we subtract 6
-12-6<3x+6-6<12-6
-18<3x<6
Now we need to get rid of 3, and for that we divide whole inequality by 3, that is
-6<x<2