Respuesta :

Answer:

C

Step-by-step explanation:

12x + 9 = 13x + 1

9-1 = 13x - 12x

8 = x

C. 8 because if you 13x and 12x together one side then subtract 9-1 from each other that equals x=8
13x-12x = 9-1
1x = 8
X = 8
Q&A Education