Explanation of x belonging to whole number but not belonging to natural number:
Whole numbers include all positive integers along with zero, while natural numbers are those positive integers excluding zero. Therefore, a number can belong to the set of whole numbers but not be classified as a natural number if it includes zero in its set but does not include any other positive integers.

Reasoning:
- Whole numbers: Whole numbers are the set of all positive integers along with zero. They are represented as {0, 1, 2, 3, ...}.
- Natural numbers: Natural numbers are the set of positive integers excluding zero. They are represented as {1, 2, 3, ...}.

Example:
- An example of a number that belongs to the set of whole numbers but not the set of natural numbers is 0.
- This is because 0 is a whole number as it is a non-negative integer, but it is not a natural number as natural numbers start from 1.

Conclusion:
In conclusion, a number can belong to the set of whole numbers but not be considered a natural number if it includes zero. It is important to understand the distinctions between these sets when classifying numbers based on their properties and characteristics.

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