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A = \left( \begin{array} { c c c } { 1 } & { - 1 } & { 3 } \\ { 2 } & { 1 } & { 0 } \\ { 3 } & { 3 } & { 1 } \end{array} \right] , 3 R _ { 3 } \text { and then } C _ { 3 } + 2 C _ { 2 } |
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