Question: Solve a Matrix with unknowns

I am taking a LA course, no problem with the math.  But Maple I don't know, and we are using Maple 12 student edition.  I have never used Maple and our underly-helpful teacher's answer is "go watch the training videos".

Here is the current hurdle:  I have a matrix with unknowns that I have to solve for.  How do I get Maple to solve for them? 

Thanks to anyone who can help.



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