A # that is + and is= ex 5=5
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The addition of the opposite, to both sides of the equation. keep it equal
The reflexive property of relations is not the same as the addition property of equality.
There is not Substitution Property of Congruence. There is, however, one for Equality, called the Substitution Property of Equality.
Why? - Mainly to help in solving equations.
Addition Property of Equality (APOE)