$A=\left[\begin{array}{rr}-28 & 17 & -13 & 15 & 29
\\-3 & 17 & 21 & -17 & 9
\\3 &-3 & 2 & 8 & 1
\\1 &1 &2 & 6 & 5
\\6 &5 &9 & 2 & 1\end{array}\right]$
**$A_{1,5}=$** [[☃ math-keypad 1]]
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