An equation contains the equality sign whereas a mathematical expression does not.
An equation is a mathematical expression which shows the relationship between two variables(or expressions), one a dependent variable and the other the independent variable.
A mathematical expression is an expression that contains at least two different numbers (or terms) and at least one mathematical operator.
An equation contains the equality sign whereas a mathematical expression does not.
So, an equation contains the equality sign whereas a mathematical expression does not.
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