Question: Solve giving incorrect solutions

I'm trying to see when a matrix becomes singular, so I took its determinant and checked when it would vanish using solve.  The problem is that solve gives me a solution that doesn't satisfy the original equation, either symbolically or numerically.  Am I doing something wrong, or is this a bug in solve?

Here's what I'm getting:

WrongSolution.mw

 

 

 

 

 

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