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Question: evaluating problem

Question:evaluating problem

Jahn 36 Maple
package
July 30 2006
0
From "t*x^3-q*x-2q^2=0" I got a complicated real solution. Then I want to evaluate "y= -x/2 -(x+2q)^2/(8t*x^2)" with the solution. But my Maple exited without results. I have tried many times. It was alway so. How can I evaluate it? Do I need some package? Or my memory (526M) is too small? Thanks
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