a numerical expression is just an expression without any equal or unequal signs, e.g. (a+2b)c or 5x-6y
an equation shows two expressions with an equal sign, e.g. (a+2b)c = 53 or 5x-6y = 3k2-7k+21
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it has to have an x number in it.
The difference between these two is that an expression only contains variables, numbers, and mathematical symbols, and an equation contains two expression with an equal sign that separate them. For example, while an expression is "2x-1", an equation is "2x-1 = 5x."
Numerical equations have only numbers and symbols, while algebraic equations have variables also.
abs(9 - 3)/2
An expression can have multiple outcomes, such as 5x+2, whereas an equation is a pair of expressions that equal each other, and can be solved, like 5x+2=12.