using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace rownanie_liniowe
{
class Program
{
double x = 0, a = 0, b = 0, c = 0;
static void Main(string[] args)
{
double a = double.Parse(Console.ReadLine());
double b = double.Parse(Console.ReadLine());
double c = double.Parse(Console.ReadLine());
double x = (c - b) / a;
if (a==0 && (c-b)!=0)
{
Console.WriteLine("BR");
}
else if (a==0 && (c-b)==0)
{
Console.WriteLine("NWR");
}
else
{
Console.WriteLine(String.Format("{0:N2}", x));
}
Console.ReadKey();
}
}
}
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