refactor: difference and equal sign

src/main/java/src/TasksFrame.java

@@ -138,10 +138,20 @@ public class TasksFrame extends JFrame {
         x.setBounds(10,50,30,20);
         x.setVisible(true);
 
+        JLabel diff = new JLabel();
+        diff.setBounds(40, 50, 10, 20);
+        diff.setVisible(true);
+        diff.setText("-");
+
         JTextField y = new JTextField();
         y.setBounds(50,50,30,20);
         y.setVisible(true);
 
+        JLabel equal = new JLabel();
+        equal.setBounds(90, 50, 30, 20);
+        equal.setVisible(true);
+        equal.setText("=");
+
         JTextField result = new JTextField();
         result.setBounds(100,50,40,20);
         result.setVisible(true);
@@ -166,6 +176,8 @@ public class TasksFrame extends JFrame {
         jPanel.add(y);
         jPanel.add(result);
         jPanel.add(difference);
+        jPanel.add(diff);
+        jPanel.add(equal);
 
     }