um well it depends on what you mean by expressions
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Expression has no answer. a equation has an answer
An equation is a ploblem with no answer and an expression is a problem with an answer so you'll get different answers with an equation and an expression.
An expression has no equal sign whereas an equation does have an equal sign
Simply put, an expression does not need an equal sign, while an equation does. Equation: x+y=z Expression: x+y
an equation has an equals sign.