Question: Few question with Maple11

I'm a new user with Maple. Please give me a clue about this, i tried search over HELP but i cannot find anything. My first question is: how can i get just a real solutions when i solve for an equation ( this one got 2 complex solutions ). The 2nd is about the linear system, I got ROOTOF solution, i think it came from the complex solution. Please download my maple file to take a look. Thank you.

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