How to delete a variable?

Hi.
I want to delete a variable so if i create it later using again "var myVar:DataType" it won't throw an error because of the duplicated variable.
I tried using delete but it says i can't use it on fixed property. I setted it to null as it states in help and again tried to delete it without luck.
So how do i delete a variable?
Thanks a lot.

You cannot delete a variable declared using "var"

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