$\displaystyle \left( \begin{array}{cccccc}-2 & 2 & -5 & : & 7\\1 & -5 & -5 & : & -27\\-4 & -3 & 3 & : & -1\\ \end{array} \right)$.
Last edited by mastermin346; Oct 10th 2012 at 02:01 AM.
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