If I have understood your question correctly, I think the answer should be:
0.5x = 5, where x is the "number".
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classifacation of algebraic expression according to the number of terms
a common factor
2n
an algebraic expression is an expression built up from constants, variables, and a finite number of algebraic operations (addition, subtraction, multiplication,division and exponentiation to a power that is a rational number). For example,
If you call your number x, the expression would be 5x.