While catching fireflies, you and a friend decide to have a competition. After m minutes, you have (3m+13) fireflies and your friend has (4m+6) fireflies.
Write an expression in simplest form that represents the number of fireflies you and your friend caught together.
If you are trying to figure it out only for that minute, you would get 7m+19 by first adding 4m and 3m and then adding 13+6. If you add those, you get 7m and 19. Combine them and you get 7m+19
