\left| \begin{array} { r r r } { 1 } & { 2 } & { 9 } \\ { 2 } & { x } – InterviewSolution

1.	\left\| \begin{array} { r r r } { 1 } & { 2 } & { 9 } \\ { 2 } & { x } & { 0 } \\ { 3 } & { 7 } & { - 6 } \end{array} \right\| = 180
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