As an aside I would use a local variable so command would look like this
c_real($MyNumber_R)
$MyNumber_R:=5000000.0
$real:=2*(MAXLONG-$MyNumber_R)

I do this so that 4D does not reset results based upon what it thinks it should 
do

I think it will work even without the .0

Regards

Chuck
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> On Feb 22, 2018, at 12:53 PM, Timothy Penner via 4D_Tech 
> <4d_tech@lists.4d.com> wrote:
> 
> 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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