1MS : 2.5.21 m

[3, -1,  1, 29]
[1,  3, 30,  6]
[1, -1,  1, 17]

L_3 <-> L_1

[1, -1,  1, 17]
[1,  3, 30,  6]
[3, -1,  1, 29]

L_2 <- L_2 - 1 * L_1

[1, -1,  1,  17]
[0,  4, 29, -11]
[3, -1,  1,  29]

L_3 <- L_3 - 3 * L_1

[1, -1,  1,  17]
[0,  4, 29, -11]
[0,  2, -2, -22]

L_3 <- 1/2 * L_3

[1, -1,  1,  17]
[0,  4, 29, -11]
[0,  1, -1, -11]

L_2 <-> L_3

[1, -1,  1,  17]
[0,  1, -1, -11]
[0,  4, 29, -11]

L_3 <- L_3 - 4 * L_2

[1, -1,  1,  17]
[0,  1, -1, -11]
[0,  0, 33,  33]

L_3 <- 1/33 * L_3

[1, -1,  1,  17]
[0,  1, -1, -11]
[0,  0,  1,   1]