1 + 1 = 2
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You cannot write an algebraic expression for that, you need an equation. The equation is n - 6 = 4
That word "equals" in there makes it an equation.
The question doesn't describe any equation. An equation states that one number or expression is equal to another number or expression. The word 'equal' is nowhere to be found or implied in the question.
"one quarter of a number increased by 5" is an expression. It is NOT an equation. There is, therefore, no method that can be used to determine what the number is.
You can call it a "number." To distinguish it from a variable expression, you can also call it a "constant."