Question 864774
X = -1,   Y = 4,   Z = 4
Add (-3 * row1) to row2
1	 2	 -1	 3	 0
0	 -7	 5	 -8	 0
2	 -2	 3	 2	 0
1	 -1	 1	 -1	 0

Add (-2 * row1) to row3
1	 2	 -1	 3	 0
0	 -7	 5	 -8	 0
0	 -6	 5	 -4	 0
1	 -1	 1	 -1	 0

Add (-1 * row1) to row4
1	 2	 -1	 3	 0
0	 -7	 5	 -8	 0
0	 -6	 5	 -4	 0
0	 -3	 2	 -4	 0

Divide row2 by -7
1	 2	 -1	 3	 0
0	 1	 -5/7	 8/7	 0
0	 -6	 5	 -4	 0
0	 -3	 2	 -4	 0

Add (6 * row2) to row3
1	 2	 -1	 3	 0
0	 1	 -5/7	 8/7	 0
0	 0	 5/7	 20/7	 0
0	 -3	 2	 -4	 0

Add (3 * row2) to row4
1	 2	 -1	 3	 0
0	 1	 -5/7	 8/7	 0
0	 0	 5/7	 20/7	 0
0	 0	 -1/7	 -4/7	 0

Divide row3 by 5/7
1	 2	 -1	 3	 0
0	 1	 -5/7	 8/7	 0
0	 0	 1	 4	 0
0	 0	 -1/7	 -4/7	 0

Add (1/7 * row3) to row4
1	 2	 -1	 3	 0
0	 1	 -5/7	 8/7	 0
0	 0	 1	 4	 0
0	 0	 0	 0	 0

Add (5/7 * row3) to row2
1	 2	 -1	 3	 0
0	 1	 0	 4	 0
0	 0	 1	 4	 0
0	 0	 0	 0	 0

Add (1 * row3) to row1
1	 2	 0	 7	 0
0	 1	 0	 4	 0
0	 0	 1	 4	 0
0	 0	 0	 0	 0

Add (-2 * row2) to row1
1	 0	 0	 -1	 0
0	 1	 0	 4	 0
0	 0	 1	 4	 0
0	 0	 0	 0	 0