|6 1 -5| |1 2 -1|
|X 0 -1| = |0 x 4|
|1 -3 2| |0 0 -6|
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6 1 -5 6 1
x 0 -1 x 0
1 -3 2 1 -3
det = 0 - 1 + 15x - 0 - 18 - 2x = 13x - 19
1 2 -1 1 2
0 x 4 0 x
0 0 -6 0 0
det = -6x + 0 + 0 - 0 - 0 - 0 = -6x
13x - 19 = -6x
13x + 6x = 19
19x = 19
x = 1
6 1 -5 6 1
x 0 -1 x 0
1 -3 2 1 -3
det = 0 - 1 + 15x - 0 - 18 - 2x = 13x - 19
1 2 -1 1 2
0 x 4 0 x
0 0 -6 0 0
det = -6x + 0 + 0 - 0 - 0 - 0 = -6x
13x - 19 = -6x
13x + 6x = 19
19x = 19
x = 1
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