Find the middle term in the expansion of `(3x-(x^3)/6)^9`

Explanation

To find the middle term in the expansion of \((3x - \frac{x^3}{6})^9\), we can follow these steps:

### Step 1: Identify the number of terms in the expansion
The number of terms in the expansion of \((a + b)^n\) is given by \(n + 1\). Here, \(n = 9\), so the number of terms is:
\[ n + 1 = 9 + 1 = 10 \]
Since there are 10 terms, the middle terms will be the 5th and 6th terms.
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