diff --git a/README.md b/README.md
index 6995ef4..5b2bce5 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,6 @@
 54 * 81 = 4374
 94 - 6 = 88
 2 - 29 = -27
-78 - 79 = -1
 80 - 41 = 39
 33 + 91 = 124
 89 * 89 = 7921