int tal = 10;
    int GAIS = 25;
    
    System.out.println(tal++ + tal++); //10+11=21
    System.out.println(tal); // 12
    
    tal = 10;
    System.out.println(tal++ + ++tal); // 10+12=22
    
    tal = 10;
    System.out.println(++tal + ++tal); // 11+12=23
    
    System.out.println(++tal - tal++ - --tal - --tal); // 13-13-13-12=-25
    
    System.out.println(tal++ - --GAIS); // 13-25=-12
    }
}