Third-order Pade' Scheme.
Matrix taken from Eq. 2.18,Page 21, 'Fundamentals of Engineering Numerical Analysis' by Parviz Moin.
Inverts the Matrix and finds x (of Ax=B) using Gauss Elimintaion (Code from Rosetta: https://rosettacode.org/wiki/Gaussian_elimination#Fortran)
Tested the code succesfully with gfortran compiler (Please note that ifortran gave different results).
Thanks to Dr.Sainath Chamarthi for the guidance!