Hello there!
To solve this, we must first combine 5m and 4m
5m + 4m = 9m
So, now we have:
9m = 72
Now, we must isolate the left side, making it equal m
To do this, we will divide both sides by 9.
9m 72
---- = ----
9 9
So, now we have:
m = 8
This means that the answer is 8.
I hope helped!
Let me know if you need anything else!
~ Zoe