![\frac{1}{21-20} \left[\begin{array}{ccc}-3&10&\\2&-7&\end{array}\right]](/tpl/images/2305/9741/28d54.png)
![\left[\begin{array}{ccc}-3&10\\2&-7&\\\end{array}\right]](/tpl/images/2305/9741/02648.png)
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