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Rule

Reflexive Property of Equality

For any real number, the number is equal to itself.

$a = a$

This property is an axiom, so it does not need a proof. This property is used to solve equations. For example, consider the equation below.

x + 3 = 8

The sum on the left-hand side can be interpreted as a number, so this sum has to equal

8 .

This implies that

x

must be equal to

5 .

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