To solve the equation \( 153x - 9 - 4 = 12 \), we start by simplifying the left side.
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Combine the constants: \[ 153x - 9 - 4 = 12 \implies 153x - 13 = 12 \]
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Next, add 13 to both sides: \[ 153x = 12 + 13 \implies 153x = 25 \]
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Now, divide both sides by 153 to find \( x \): \[ x = \frac{25}{153} \]
The problem specifies \( x \neq \) (meaning there is a restriction or value to avoid). Since we found \( x = \frac{25}{153} \), the complete answer is:
\[ x \neq \frac{25}{153} \]
Thus, you can fill in the blank with \( \frac{25}{153} \).