Gauss backward elimination, Fortran

Gauss backward elimination

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 ENTER THE DIMENSION OF THE SYSTEM
 ENTER THE ELEMENT OF A (ROW-WISE)
   2.00000000       6.00000000       2.00000000       6.00000000    
   0.00000000      -16.0000000      -3.00000000       14.0000000    
   0.00000000       0.00000000       3.06250000       18.3750000    
 THE SOLUTION VECROT IS
           1   3.00000000    
           2  -2.00000000    
           3   6.00000000

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