A term.
Term
A number that one is solving for-the unknown.
Since the variable may be real or complex, there is no single word or phrase to describe such a thing.
The word "variable" represents an unknown number.
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The most likely reason for this is that allowing variable names to start with a number would introduce ambiguity as to whether a word is a variable or a number. As it is, the compiler can tell which is which just by examining the first character.
The word that describes substituting a number for a variable in an expression and solving is "evaluation." Evaluation involves replacing the variable with a specific value and then performing the necessary calculations to determine the result. This process is essential in algebra to find the numerical outcome of expressions.
a variable minus a number and the same variable is b-6b= -5b
Gottfried Wilhelm Leibniz
For example in the term 3x the number is the coefficient of the variable x
the number next to a variable that multiplies the variable
The base word for variable is "vary".