DUE TONIGHT. Im really confused please help me with what you can and show work. I will mark Brainly!!

Answer:
The answer is A
Step-by-step explanation:
8a+a−3+6a−2a−3
=8a+a+−3+6a+−2a+−3
Combine the like terms:
=8a+a+−3+6a+−2a+−3
=(8a+a+6a+−2a)+(−3+−3)
=13a+−6
Answer:
=13a−6