x - 2y + 3z = 6
2x + 3y - 4z = 20
3x - 2y + 5z = 6
∆ = 1 -2 3 = 12
2 3 -4
3 -2 5
∆1 = 6 -2 3 = 116
20 3 -4
6 -2 5
∆2 = 1 6 3 = -152
2 20 -4
3 6 5
∆3 = 1 -2 6 = -116
2 3 20
3 -2 6
x1 = ∆1 / ∆ = 116 / 12 = 29/3
x2 = ∆2 / ∆ = -152 / 12 = -38/3
x3 = ∆3 / ∆ = -116 / 12 = -29/3