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what mathematicians agreed on an so that numercial expressions would have only one value?
Because that is a rule mathematicians agreed upon many years ago.
Yes, except for one thing: mathematicians are not agreed whether 0 belongs to it.
All negative integers are whole numbers but not natural numbers. Mathematicians are not agreed about whether 0 is a natural number or not.
Every positive whole number, such as 1, 2, 3, and so on. Mathematicians are not agreed on whether 0 is or is not a natural number.