Simply put, an expression does not need an equal sign, while an equation does.
Equation:
x+y=z
Expression:
x+y
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Expression has no answer. a equation has an answer
An expression has no equal sign whereas an equation does have an equal sign
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 equation has an equals sign.
An expression is a statement of terms and has no equal sign. An equation is a statement of two terms that equal each other.