it has to have an x number in it.
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Numerical equations have only numbers and symbols, while algebraic equations have variables also.
abs(9 - 3)/2
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
You evaluate the expression !! :)
Numerical Expression