<PRE><B>Question 415746</B>
           1   1  -1   6
           3  -2   1  -5
           1   3  -2  14
***
1  1 -1   6
4 -1  0   1 R1+R2 
0 -2  1  -8 R1-R3
***
1  -1  0 -2 R3+R1
4  -1  0  1
0  -2  1 -8             
***
3   0  0  3 R2-R1
4  -1  0  1
0  -2  1 -8
***
1   0  0  1 R1/3
4  -1  0  1  
0  -2  1 -8
***
1   0  0  1 
0   1  0  3 4R1-R2 
0  -2  1 -8
***
1   0  0  1
0   1  0  3
0   0  1 -2 2R2+R3
</PRE>