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Question: Maple doesn't remember the variables that I define with :=

Question:Maple doesn't remember the variables that I define with :=

kneehowguys 20 Maple
autoexecute
April 23 2014
2

I say 

 

A:=1

R:=8.3

T=298

 

And do A/RT and I get a number answer. Sucess!.

 

Then I close the program. Open it again. Type A/RT and it spits out A/RT.

 

How do I get to not forget what the numbers were? 
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