Not necessarily.
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Algebraic expressions are terms that do not include an equality sign
They are identical or equivalent.
They are called: Identical equations or IdentitiesSee: http://www.tutorvista.com/search/value-algebraic-expressions-33 - -7 = ss = -26
Yes. That is the definition of an algebraic expression.
Only like terms can be subtracted or added in algebraic expressions.