[b, a, c; 0, -2, b; a, 1, c]·[-1; 2; 4] = [2; 4; -3]
a = 3 ∧ b = 2 ∧ c = -0.5
A^{-1} = [2, 3, -0.5; 0, -2, 2; 3, 1, -0.5]
Inverse
A = (A^{-1})^{-1} = [- 1/13, 1/13, 5/13; 6/13, 1/26, - 4/13; 6/13, 7/13, - 4/13]
Probe:
[- 1/13, 1/13, 5/13; 6/13, 1/26, - 4/13; 6/13, 7/13, - 4/13]·[2; 4; -3] = [-1; 2; 4]