I think that using the MAXLONG constant is causing the value to be treated as a 
longint.
$Real := 2 * (MAXLONG - 5000000)

If you replace the MAXLONG constant with a value you get the correct result:
$Real := 2 * (2147483647 - 5000000)

Interestingly, you can keep using the MAXLONG constant if you do something like 
this:
$Real := 2 * (MAXLONG - 5000000.1)



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