For any function f(x) with domain D, if a=b is an element of D, then f(a)=f(b).
(Never seen it, but is true and replaces all other properties of equality.)
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There is not Substitution Property of Congruence. There is, however, one for Equality, called the Substitution Property of Equality.
A # that is + and is= ex 5=5
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.
The multiplication property of equality is, as the name suggests, a property. It does not require solving!