An Equation.
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No an algebraic expression does not contain an equal sign.
An algebraic expression
An equation has an equal = sign whereas an expression does not.
Equation: x+3=3+x (notice the equal sign: equal; equation)Expression: x+3 (notice no equal sign)
An algebraic expression doesn't have an equal sign (e.g. 4x+7) whereas an algebraic equation does (e.g. 4x+7=19). 4x=19-7 4x=12 x=12/4 x=3