diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/12.en/textbook.fr.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/12.en/textbook.fr.md
index bc36ed768..1725e6ab5 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/12.en/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/12.en/textbook.fr.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
 ---