the missing number or what you are solving for in a problem is the
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a set
order pair
An ordered set of numbers is a set of numbers in which the order does matter. In ordinary sets {A, B} is the same as {B, A}. However, the ordered set (a, b) is not the same as the ordered set (B, a).
The rational numbers, the real numbers and sets of higher order which contain the reals such as the complex numbers.
natural numbers!!