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	$\begin{array}{l}
 \left( {\begin{array}{*{20}c}
 {\left. {\begin{array}{*{20}c}
 1 & 1 & 1 & 0  \\
 2 & { - 2} & { - 5} & 0  \\
 3 & 0 & 1 & 1  \\
 4 & { - 2} & { - 3} & 1  \\
 \end{array}} \right|} & {\begin{array}{*{20}c}
 6  \\
 { - 13}  \\
 {13}  \\
 1  \\
 \end{array}}  \\
 \end{array}} \right) \\
 R2 - 2R1 \to R2 \\
 R3 - 3R1 \to R3 \\
 R4 - 4R1 \to R4 \\
 \left( {\begin{array}{*{20}c}
 {\left. {\begin{array}{*{20}c}
 1 & 1 & 1 & 0  \\
 0 & { - 4} & { - 7} & 0  \\
 0 & { - 3} & { - 2} & 1  \\
 0 & { - 6} & { - 7} & 1  \\
 \end{array}} \right|} & {\begin{array}{*{20}c}
 6  \\
 { - 25}  \\
 { - 5}  \\
 { - 23}  \\
 \end{array}}  \\
 \end{array}} \right) \\
 4R3 - 3R2 \to R3 \\
 2R4 - 3R2 \to R4 \\
 \left( {\begin{array}{*{20}c}
 {\left. {\begin{array}{*{20}c}
 1 & 1 & 1 & 0  \\
 0 & { - 4} & { - 7} & 0  \\
 0 & 0 & {13} & 4  \\
 0 & 0 & 7 & 2  \\
 \end{array}} \right|} & {\begin{array}{*{20}c}
 6  \\
 { - 25}  \\
 {55}  \\
 {29}  \\
 \end{array}}  \\
 \end{array}} \right) \\
 13R4 - 7R3 \to R4 \\
 \left( {\begin{array}{*{20}c}
 {\left. {\begin{array}{*{20}c}
 1 & 1 & 1 & 0  \\
 0 & { - 4} & { - 7} & 0  \\
 0 & 0 & {13} & 4  \\
 0 & 0 & 0 & { - 2}  \\
 \end{array}} \right|} & {\begin{array}{*{20}c}
 6  \\
 { - 25}  \\
 {55}  \\
 { - 8}  \\
 \end{array}}  \\
 \end{array}} \right) \\
 \left( {\begin{array}{*{20}c}
 {\left. {\begin{array}{*{20}c}
 1 & 1 & 1 & 0  \\
 0 & { - 4} & { - 7} & 0  \\
 0 & 0 & {13} & 4  \\
 0 & 0 & 0 & 1  \\
 \end{array}} \right|} & {\begin{array}{*{20}c}
 6  \\
 { - 25}  \\
 {55}  \\
 4  \\
 \end{array}}  \\
 \end{array}} \right) \\
 \left( {\begin{array}{*{20}c}
 {\left. {\begin{array}{*{20}c}
 1 & 1 & 1 & 0  \\
 0 & { - 4} & { - 7} & 0  \\
 0 & 0 & {13} & 0  \\
 0 & 0 & 0 & 1  \\
 \end{array}} \right|} & {\begin{array}{*{20}c}
 6  \\
 { - 25}  \\
 {39}  \\
 4  \\
 \end{array}}  \\
 \end{array}} \right) \\
 \left( {\begin{array}{*{20}c}
 {\left. {\begin{array}{*{20}c}
 1 & 1 & 1 & 0  \\
 0 & { - 4} & { - 7} & 0  \\
 0 & 0 & 1 & 0  \\
 0 & 0 & 0 & 1  \\
 \end{array}} \right|} & {\begin{array}{*{20}c}
 6  \\
 { - 25}  \\
 3  \\
 4  \\
 \end{array}}  \\
 \end{array}} \right) \\
 \left( {\begin{array}{*{20}c}
 {\left. {\begin{array}{*{20}c}
 1 & 1 & 1 & 0  \\
 0 & { - 4} & 0 & 0  \\
 0 & 0 & 1 & 0  \\
 0 & 0 & 0 & 1  \\
 \end{array}} \right|} & {\begin{array}{*{20}c}
 6  \\
 { - 4}  \\
 3  \\
 4  \\
 \end{array}}  \\
 \end{array}} \right) \\
 \left( {\begin{array}{*{20}c}
 {\left. {\begin{array}{*{20}c}
 1 & 0 & 0 & 0  \\
 0 & 1 & 0 & 0  \\
 0 & 0 & 1 & 0  \\
 0 & 0 & 0 & 1  \\
 \end{array}} \right|} & {\begin{array}{*{20}c}
 2  \\
 1  \\
 3  \\
 4  \\
 \end{array}}  \\
 \end{array}} \right) \\
 \end{array}
 $
 
       
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