public class subtract_NW {

    public static void main(String[] args) {

        int a = 5;
        int b = 7;

        System.out.println("int a is " + a + " (5)"); // 5
        System.out.println("int b is " + b + " (7)"); // 7

        System.out.println(a + " + " + b);
        a += b; // 5+7 = 12

        System.out.println(a + " - " + b);
        b = a-b; // 12-7 = 5

        System.out.println(a + " - " + b);
        a -= b; // 12-5 = 7

        System.out.println("int a is " + a + " (7)"); // 7
        System.out.println("int b is " + b + " (5)"); // 5

    }
}