diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/textbook.es.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/textbook.es.md
index 6c3e3786a..833f1f7dd 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/textbook.es.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/textbook.es.md
@@ -4,8 +4,6 @@ published: true
 routable: true
 visible: false
 lessons:
-    - slug: brainstorming-123-mathematical-tools
-      order: 3
     - slug: brainstorming-234-mathematical-tools
       order: 2
 ---