An equation is equal if you have a math problem on each side of an equal sign.
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If it doesn't have an equal sign, then it's not an equation.
An expression has no equal sign whereas an equation does have an equal sign
Equality. If they are ALWAYS equal then the equation is an identity.
An equation has an equal sign, a expression does not.
An equation states that the two quantities on each side of the equal sign are equal.