Respuesta :

The answer would be 15m + 2n.

1. Gather like terms (8m + 7m) + (4n - 2n)

2. Simplify (15m + 2n)
8m 4n 7m 2n
*Combine Like Terms:* 
=8m 4n 7m 2n
=(8m 7m(4n 2n)
Answer:
15m 2n   

Hope this helps! :)