diff --git a/education/computer engineering/ECE2700/Binary Logic.md b/education/computer engineering/ECE2700/Binary Logic.md
index d3fd225..a5eb710 100644
--- a/education/computer engineering/ECE2700/Binary Logic.md	
+++ b/education/computer engineering/ECE2700/Binary Logic.md	
@@ -7,9 +7,9 @@
 | 4.     | if $x = 0$ then $\overline{x} = 1$ |                    | if $x = 1$ then $\overline{x} = 0$ |                    |
 | 5.     | $x \cdot 0 = 0$                    |                    | $x + 1 = 1$                        |                    |
 | 6.     | $x \cdot 1 = x$                    |                    | $x + 0 = x$                        |                    |
-| 7.     | $x \cdot                           |                    |                                    |                    |
-| 8.     |                                    |                    |                                    |                    |
-| 9.     |                                    |                    |                                    |                    |
+| 7.     | $x \cdot x = x$                    |                    | $x + x = x$                        |                    |
+| 8.     | $x \cdot \overline{x} = 0$         |                    | $$x + \overline{x} = 1$            |                    |
+| 9.     | $\overline{\overline{x}} =         |                    |                                    |                    |
 | 10.    |                                    |                    |                                    |                    |
 | 11.    |                                    |                    |                                    |                    |
 | 12.    |                                    |                    |                                    |                    |