Respuesta :

Answer:

a=5

Step-by-step explanation:

can i have brainliest?

Answer:

Step-by-step explanation:

3(a-4) + 1=9-a​

3a - 12 + 1 = 9 - a

3a + a = 9 + 12 - 1

4a = 20

a = 20/4

a = 5