Answers: 1
![\left[\begin{array}{cccc}-1&-3&|&-17\\2&-6&|&-26\\\end{array}\right]](/tpl/images/0055/0059/e3176.png)
![\left[\begin{array}{cccc}1&3&|&17\\2&-6&|&-26\\\end{array}\right]](/tpl/images/0055/0059/631fa.png)
![\left[\begin{array}{cccc}1&3&|&17\\0&-12&|&-60\\\end{array}\right]](/tpl/images/0055/0059/9fc8f.png)
. So.......![\left[\begin{array}{cccc}1&3&|&17\\0&1&|&5\\\end{array}\right]](/tpl/images/0055/0059/6e05f.png)
![\left[\begin{array}{cccc}1&0&|&2\\0&1&|&5\\\end{array}\right]](/tpl/images/0055/0059/ac246.png)
and 
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