import java.io.*;

class ecgr1_modif
{

public static void main(String args[])
{
	double a=0, b=0, x;
	if(args.length==2)
	{
	a = (Double.valueOf(args[0])).doubleValue();
	b = (Double.valueOf(args[1])).doubleValue();
	}
	try{
		System.out.println(" x=" + -b/a);
	   }catch(ArithmeticException e){System.out.println("Coeficient nul!!!");}
}
}