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Let M be a 3xx3 matrix satisfying M[[...

Let `M` be a `3xx3` matrix satisfying `M[[0], [1] ,[0]]=[[-1], [2], [3]]` , `M[[1],[-1], [0]]=[[1], [1],[-1]]`,and `M[[1], [1], [1]]=[[0] ,[0], [12]]` Then the sum of the diagonal entries of `M` is _________.

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CENGAGE PUBLICATION-MATRICES-All Questions
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