Find the equation of the set of points which are equidistant from the points `(1, 2, 3)`and `(3, 2, 1)`.

Explanation

To find the equation of the set of points that are equidistant from the points \( A(1, 2, 3) \) and \( B(3, 2, 1) \), we can follow these steps:

### Step 1: Define the points and the point \( P \)
Let the point \( P \) have coordinates \( (x, y, z) \). The points \( A \) and \( B \) are given as:
- \( A(1, 2, 3) \)
- \( B(3, 2, 1) \)

### Step 2: Set up the distance equations
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