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File: /home/iestorre/www2/proyectointegrado/2bachA/planoafin/eXe_LaTeX_math_19.1.gif.tex
\begin{vmatrix} 2 & -1& 3\\ 1 & 2 & -1\\ -1 & -1 & 5 \end{vmatrix} = 20-3-1+6-2+5= 25