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Question: Linear programming

Question:Linear programming

Arcas Gabriel 5 Maple
simplex
November 02 2017
1

Hello guys, I have a problem using simplex, at linear exercises.

Example:

> Typesetting[delayDotProduct](with, simplex, true);
> minimize (4*x1+3*x2+5*x3,{x1-2*x2+3*x3>=-1,x1+x2-x3>=1},NONNEGATIVE);

And I got an error:

Error, Got internal error in Typesetting:-Parse : "'_Inert_DELAYLESSEQ' is not a valid inert form"

How can I solve this? I'm new in Maple software. I'm using Maple15.

Thank you, have a nice day!
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