Question: Why doesn't this command work as we expect?!

Dear Friends, I asked my question here http://stackoverflow.com/questions/13677399/why-this-program-cant-work and got one answer. I don't want to prove that if Maple is unable solve my problem or not, but want to know if you agree with the answer there. What can I do with this problem noted there which happened during teaching in the class and made me ashamed badly.

Best and Thanks.

 

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