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A = \left[ \begin{array} { c c c } { 1 } & { 0 } & { 0 } \\ { 2 } & { 3 } & { 4 } \\ { 5 } & { - 6 } & { x } \end{array} \right] \text { and det } A = 45 , \text { then find } x |
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