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\left( {\begin{array}{*{20}{c}} 1 & 2 & { - 2}\\ 0 & { - 5} & 8\\ 0 & { - 5} & 8\\ \end{array}} \right) \to \,\,\,\,\,\,\,\begin{array}{*{20}{c}} {}\\ {{F_2} - {F_3}}\\ {{F_3} - {F_2}}\\ \end{array}\,\,\left( {\begin{array}{*{20}{c}} 1 & 2 & { - 2}\\ 0 & 0 & 0\\ 0 & 0 & 0\\ \end{array}} \right)