Let's solve the equation step by step:
The equation is:
\[ 9z + 9z - 2 = 12 \]
Combine like terms:
\[ 18z - 2 = 12 \]
Now, add 2 to both sides:
\[ 18z = 12 + 2 \]
\[ 18z = 14 \]
Next, divide both sides by 18:
\[ z = \frac{14}{18} \]
This can be simplified:
\[ z = \frac{7}{9} \]
So, the solution of the equation is:
None of the options provided directly match \(\frac{7}{9}\).
However, if you need to choose from the options given, the closest correct conclusions that can be derived from possibly a misunderstanding or confusion in choices:
- It is not 12 or 3.
- It is not "no solution."
- It might not appear among the choices given as is.
Therefore, please verify the problem statement or the options might be incomplete or incorrect.