Ononot — Find the trace of the matrix M = \begin{pmatrix} 5 & -2 & 1

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Find the trace of the matrix $M = \begin{pmatrix} 5 & -2 & 1 \\ 3 & 7 & 0 \\ 4 & 1 & -3 \end{pmatrix}$ . (Trace = sum of diagonal elements)