![\mathtt\red{\left[ \begin{array} { l } { 1 } & { 3 } \\ { 2 } & { 1 } \end{array} \right] = \left[ \begin{array} { l } { 4 } \\ { - 1 } \end{array} \right]} \mathtt\red{\left[ \begin{array} { l } { 1 } & { 3 } \\ { 2 } & { 1 } \end{array} \right] = \left[ \begin{array} { l } { 4 } \\ { - 1 } \end{array} \right]}](https://tex.z-dn.net/?f=%5Cmathtt%5Cred%7B%5Cleft%5B+%5Cbegin%7Barray%7D++%7B+l++%7D++%7B+1+%7D+%26amp%3B+%7B+3+%7D+%5C%5C+%7B+2+%7D+%26amp%3B+%7B+1+%7D+%5Cend%7Barray%7D+%5Cright%5D+%3D+%5Cleft%5B+%5Cbegin%7Barray%7D++%7B+l++%7D++%7B+4+%7D+%5C%5C+%7B+-+1+%7D+%5Cend%7Barray%7D+%5Cright%5D%7D)
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