Which of these is a two-step equation?
A. x + 9 = 21 incorrect answer
B. x = 11 + 2 incorrect answer
C. 2x + 9 = 21 incorrect answer
D. x/3 = 9

Respuesta :

Answer: I believe is C

Step-by-step explanation:

2x=21-9

x=12/2

Answer:

d

Step-by-step explanation: