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It could represent an unknown variable in an expression or an equation.
It could be x/16 or 16/x. The x could be substituted by any other letter, for example, y/16 or 16/y.
It could be: 6.3-2 = 4.3
An equation has the 'equals' sign ( = ) in it. An expression hasn't.
n-5 is an expression, it cannot be a solution. Furthermore, there are infinitely many possible equations for which n = 5 could be a solution - even with the added requirements of the question.