//
//	solve the linear equ. ax+b=0
//

import java.util.*;
class LinearEq
{
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		double a, b, x;


		System.out.print("Input a: ");	// prime read
		a = input.nextDouble();
		System.out.print("Input b: ");
		b = input.nextDouble();

		while(a != 0)						// sentinel controlled loop
		{
			x = -b/a;
			System.out.println("x = " + x);

			System.out.print("\n\nInput a: ");	// UPDATE
			a = input.nextDouble();
			System.out.print("Input b: ");
			b = input.nextDouble();
		}

		System.out.println("\n\nDone.\n\n\n");
	}
}