Respuesta :
Answer: 9a+15
Explanation: We are combining like terms so we can rearrange the equation to
(3a+6a) and (9+6)
3a+6a= 9a
9+6=15
So 9a+15
Explanation: We are combining like terms so we can rearrange the equation to
(3a+6a) and (9+6)
3a+6a= 9a
9+6=15
So 9a+15