Problem:
Find the distance from the point ${\frac{12}{7}, 3}$ to the line $3 x+\frac{31 y}{7}+\frac{20}{7}=0$.
Answer:
$\frac{149}{\sqrt{1402}}$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/point_to_plane_distance/3180.txt'}