Gauss forward elimination, Fortran

Gauss forward elimination

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 ENTER THE DIMENSION OF THE SYSTEM
 ENTER THE ELEMENT OF A (ROW-WISE)
  -14.0000000       0.00000000       0.00000000      -42.0000000    
   11.0000000       7.00000000       0.00000000       19.0000000    
  -3.00000000      -4.00000000       1.00000000       5.00000000    
 THE SOLUTION VECROT IS
           1   3.00000000    
           2  -2.00000000    
           3   6.00000000

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