An algebraic expression consists of variables, constants and operators (+, -, / ,x). An algebraic expression is the sum of algebraic terms.

When an algebraic expression is equated to another algebraic expression or zero, it becomes an algebraic equation.

• $\frac{x}{2}-3$ has the variable $x$, constant term $3$ and the operator ${}^{\prime }{-}^{\prime }$.


• $4x+7$ has the variable $x$, constant term $7$ and the operator ${}^{\prime }{+}^{\prime }$.


• $3$ can be written as $3x^0+0$ which has a variable term, constant term and the operator.

Hence, $\frac{x}{2}-3,4x+7$ and $3$ are algebraic expressions where as $x=10$ is an algebraic equation.