diff --git a/README.md b/README.md
index 7897a9c..dd54143 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,6 @@
 64 * 11 = 704
 83 + 17 = 100
 37 - 58 = -21
-12 - 91 = -79
 20 - 52 = -32
 25 + 25 = 50
 86 + 61 = 147