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Her face showed a clear expression of surprise.

A particular way of expressing thoughts, feelings, or ideas.
His expression was unreadable.
She had a happy expression.
What is that expression?
facial expression
clear expression
hide expression
look
appearance
manner
The expression 2x + 5 is a simple algebraic phrase.

A mathematical phrase that can contain numbers, variables, and operators.
This expression has two terms.
Write the expression in simplest form.
The expression equals zero.
algebraic expression
mathematical expression
simplify an expression
formula
equation
term