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  #include "stdio.h" 
  #include "agsdl.c" 
  main() 
  { int i; 
    double eps; 
    static double a[4][4]={ {7.0,2.0,1.0,-2.0},{9.0,15.0,3.0,-2.0}, 
                          {-2.0,-2.0,11.0,5.0},{1.0,3.0,2.0,13.0}}; 
    static double x[5],b[4]={4.0,7.0,-1.0,0.0}; 
    eps=0.000001; 
    if (agsdl(a,b,4,x,eps)>0) 
      for (i=0;i<=3; i++) 
        printf("x(%d)=%13.7e\n",i,x[i]); 
  }