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To simplify the denominator of the expression \( -(-3)^2 \), we start by evaluating \((-3)^2\).
\[
(-3)^2 = 9
\]
Now, substituting this value back in, we have:
\[
-(-3)^2 = -9
\]
Thus, the simplified denominator is:
\[
\boxed{-9}
\]