Let's solve the equation \( 9z + 9z - 2 = 12 \).
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Combine like terms on the left side: \[ 18z - 2 = 12 \]
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Add 2 to both sides: \[ 18z = 14 \]
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Divide by 18: \[ z = \frac{14}{18} = \frac{7}{9} \]
So, the solution to the equation is \( z = \frac{7}{9} \). However, this result is not listed in your responses. Thus, the closest answer would be:
no solution
if we strictly adhere to the options given (as none matches the computed value).
If you were expecting a specific answer amongst the options based on standard rounding or simplifications, none of them fit the calculated solution based on the equation provided.