To solve the equation \( x + 23 = 9 \), you need to isolate \( x \). Here are the steps:
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Subtract 23 from both sides of the equation:
\[ x + 23 - 23 = 9 - 23 \]
This simplifies to:
\[ x = 9 - 23 \]
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Calculate \( 9 - 23 \):
\[ 9 - 23 = -14 \]
So, the solution is \( x = -14 \).
Therefore, among the provided responses, the correct answer is:
−14 (negative 14).