2x+3 is an algebra or algebraic expression because an algebraic expression is one or more algebraic terms in a phrase. It can include variables, constants, and operating symbols, such as plus and minus signs. It's only a phrase, not the whole sentence, so it doesn't include an equal sign. so 2xy +3x is an algebraic expression but x+y=2 is NOT.
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Algebra.
x = 1/2. y = -3/7.
8 - 1/3
An algebra expression is 2 or more terms which does not contain an equality sign as for example 2x+y-3z