That means that you replace something, for something else. For example, a variable for a number, or a variable for some other expression.
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Substitution
substitution property transitive property subtraction property addition property
There is not Substitution Property of Congruence. There is, however, one for Equality, called the Substitution Property of Equality.
Yes. That is the definition of an algebraic expression.
Algebraic expressions are terms that do not include an equality sign