Respuesta :

12A + 2 + A - 1
combine like terms
12A + A = 13A
2 - 1 = 1
so we have : 13A + 1 <===

12A + 2 + A - 1

Combine like terms

12A + A = 13A

2 - 1 = 1

13A + 1, or (D) is your answer

hope this helps