An algebraic expression can have a mixture of numbers and variables, but it does not contain an equals sign.
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You replace each variable by its value. Then you do the indicated calculations.
Only if it has an equality sign otherwise it is an expression.
It is a numerical expression.
An expression.
5+6+36-4=43 * * * * * That is an equation, not an expression. An expression might be 5+6+36-4 or 43 but when you put the + sign (or <, > etc) it becomes an equation (or inequality).