Question: Error in solving a system of equation

I was trying to solve 3 equation with 3 unknown. After solving the problem by Maple, I put the answers in the primary equations and I expected  the result for each equation be zero. I did it just for testing the correctness of answers.  But unfortunatly one of the answer is not zero. What is the problem? I attached my worksheet to this post. Improved_GU.mw

 

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Vahid

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