You are given an integer array `nums` consisting of `2 * n` integers.

You need to divide `nums` into `n` pairs such that:

- Each element belongs to exactly one pair.
- The elements present in a pair are equal.

Return `true` if nums can be divided into `n` pairs, otherwise return `false`.

Example 1:

    Input: nums = [3,2,3,2,2,2]
    Output: true
    Explanation:
    There are 6 elements in nums, so they should be divided into 6 / 2 = 3 pairs.
    If nums is divided into the pairs (2, 2), (3, 3), and (2, 2), it will satisfy all the conditions.

Example 2:

    Input: nums = [1,2,3,4]
    Output: false
    Explanation:
    There is no way to divide nums into 4 / 2 = 2 pairs such that the pairs satisfy every condition.

Constraints:

- `nums.length == 2 * n`
- `1 <= n <= 500`
- `1 <= nums[i] <= 500`