Roth's natural constant

Roth's natural constant by M. Roth (*2003) is defined as b=0 as an assumption for every too complicated mathematical equation with parameter determination.

Find the coordinates of P (a+1|1-2a|2a) which has the distance d=3 from the plane A: 4x-4y-2z=2.

Answer: a=b=0 because you have no idea what belongs in there so you use Roth's natural constant for a.