Question 868933
2 –1 +0 4
0 +2 +1 5
2 +0 +1 7

gauss jordan method
Divide row1 by 2
1	 -1/2	 0	 2
0	 2	 1	 5
2	 0	 1	 7

Add (-2 * row1) to row3
1	 -1/2	 0	 2
0	 2	 1	 5
0	 1	 1	 3

Divide row2 by 2
1	 -1/2	 0	 2
0	 1	 1/2	 5/2
0	 1	 1	 3

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

Divide row3 by 1/2
1	 -1/2	 0	 2
0	 1	 1/2	 5/2
0	 0	 1	 1

Add (-1/2 * row3) to row2
1	 -1/2	 0	 2
0	 1	 0	 2
0	 0	 1	 1

Add (1/2 * row2) to row1
1	 0	 0	 3
0	 1	 0	 2
0	 0	 1	 1
x=3 y=2 z=1
Cramers rule
*[invoke cramers_rule_3x3 2, -1, 0, 4, 0, 2, 1, 5, 2, 0, 1, 7]