JavaScript básico: asignación del valor de una variable a otra

In this challenge I suppose that the last answer is a = b, after assigning the value 7 to the variable a and matching both variables, but in my case it does not give me the answer as well corrected. Here is my response code:
// Configuración
var a;
a = 7;
var b;
b = 7;
a = b;
// Cambia solo el código debajo de esta línea

OK, thank you very much.

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