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Where is variables located in a PIC?

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I'm programming a PIC18F452 microcontroller and I have a pretty basic question about pic programming:
Where is a variable stored if I declare/initialize it using 'equ', 'variable', 'constant' or 'set'? Is it from the first position in the Data RAM? Does it differ anything between the 4 "instructions" conserning where they are placed?
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