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Question: how do I show the grapichs from DEplot?

Question:how do I show the grapichs from DEplot?

Aghnia Ulfiro 15 Maple 18
detools deplot
July 09 2018
2

hello! i have a problem about DEplot. can some of you help me to solve this problem? I use Maple 18. here the problem I've

restart;
with(DEtools);
 
>DE3:={diff(y(x),x)=y(x)-z(x),diff(z(x),x)=z(x)-2*y(x)};    
>DEplot(DE3,[y(x),z(x)],x=0..3,y=0..2,z=-4..4,arrows=large);

   when i enter it, I dont get the graphic. can you tell me why? thank you!
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