1MS : 2.5.21 l

[-1, -2,  3, 17]
[-2,  2,  3, 36]
[ 5,  2, -1, 10]

L_1 <- -1 * L_1

[ 1, 2, -3, -17]
[-2, 2,  3,  36]
[ 5, 2, -1,  10]

L_2 <- L_2 + 2 * L_1

[1, 2, -3, -17]
[0, 6, -3,   2]
[5, 2, -1,  10]

L_3 <- L_3 - 5 * L_1

[1,  2, -3, -17]
[0,  6, -3,   2]
[0, -8, 14,  95]

L_2 <- 1/3 * L_2

[1,  2, -3, -17]
[0,  2, -1, 2/3]
[0, -8, 14,  95]

L_3 <- L_3 + 4 * L_2

[1, 2, -3,   -17]
[0, 2, -1,   2/3]
[0, 0, 10, 293/3]

L_3 <- 1/10 * L_3

[1, 2, -3,    -17]
[0, 2, -1,    2/3]
[0, 0,  1, 293/30]

L_2 <- L_2 + 1 * L_3

[1, 2, -3,    -17]
[0, 2,  0, 313/30]
[0, 0,  1, 293/30]

L_1 <- L_1 + 3 * L_3

[1, 2, 0, 123/10]
[0, 2, 0, 313/30]
[0, 0, 1, 293/30]

L_1 <- L_1 - 1 * L_2

[1, 0, 0,  28/15]
[0, 2, 0, 313/30]
[0, 0, 1, 293/30]

L_2 <- 1/2 * L_2

[1, 0, 0,  28/15]
[0, 1, 0, 313/60]
[0, 0, 1, 293/30]