It is the order of arithmetical operations and is known as BODMAS or BIDMAS meaning brackets, indices, division, multiplication, addition and subtraction
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If you call your number x, the expression would be 5x.
A expression that only contains numbers is a Numerical
You have to substitute a value for the letter variable in the expression. This is what we call evaluating the algebraic expression. An example would be 3x+1=7, when x=2.
factor
If you call the number "n", then the expression would be "n+5".