9 < -3m < 24
First you want to separate them.
-3m > 9
-3m < 24
Then you want to solve them individually.
(Remeber to flip the signs when dividing negatives!)
-3m > 9
m < -3
-3m < 24
m > -8
Then you would put them together if the directions say "and" (smaller number on the left)
-8 < m < -3
Seperate them if the directions say "or"
m > -8 OR m < -3
Good luck! :D