Respuesta :

Group like terms:
7pq^2+pq^2+6pq-5pq-9+4

Now group similar terms:
7pq^2+pq^2+pq-5 (I subtracted 5pq from 6pq and added -9+4)

8pq^2+pq-5 (This is your final answer since you cannot simplify any further)