Linear Equation System by Gauss Method

Input data: coefficients for unknown, free members.
Results: found values of unknown and time of operation of this program.
The Gauss Method is a classic method of solving the system of linear algebraic equations.
This is the method of consistent exclusion of variables, when with the help of elementary transformations the system of equations leads to an equal system of a triangular type, from which consistently, starting from the latter (by number), all the variable systems are located.