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Question: how to solve the error of extra unknowns found

Question:how to solve the error of extra unknowns found

nurul 10 Maple 16
error fieldplot
October 09 2014
1

> with(DEtools);
> with(plots);
> a := diff(y(x), x) = e(x)^(-0.1e-1*xy^2);

> g := dfieldplot(a, y(x), x = -8 .. 8, y(x) = -8 .. 8, color = e(x)^(-0.1e-1*xy^2));
Error, (in DEtools/dfieldplot) extra unknowns found: xy

 

how to solve this?
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