f: X = [1, 1, 1] + r·[-1, 2, 3]
g: X = [1, 0, 2] + s·[1, 1, 4]
N = [-1, 2, 3] ⨯ [1, 1, 4] = [5, 7, -3]
[1, 1, 1] + r·[-1, 2, 3] + s·[5, 7, -3] = [1, 0, 2] + t·[1, 1, 4] → r = -21/83 ∧ s = -10/83 ∧ t = -29/83
P = [1, 1, 1] - 21/83·[-1, 2, 3] = [104/83, 41/83, 20/83]
Q = [1, 0, 2] - 29/83·[1, 1, 4] = [54/83, - 29/83, 50/83]