diff --git a/README.md b/README.md
index 22f0187..005ab85 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,6 @@
 58 - 87 = -29
 95 + 66 = 161
 99 + 67 = 166
-67 - 80 = -13
 72 * 70 = 5040
 39 / 1 = 39
 85 / 7 = 12