diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/10.n1/textbook.fr.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/10.n1/textbook.fr.md
index 8cdd5f7f0..dd3b8f053 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/10.n1/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/10.n1/textbook.fr.md
@@ -4,8 +4,6 @@ published: true
 routable: true
 visible: false
 lessons:
-    - slug: brainstorming-123-mathematical-tools
-      order: 1
     - slug: brainstorming-g12-mathematical-tools
       order: 2
 ---