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 36520f15c..20acf1910 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
@@ -18,8 +18,6 @@ lessons:
 
 --------------------------------
 
---------------------------------
-
 con una **primera clasificación para ordenar** la lluvia de ideas (conteo, geometría, etc.).
 *No presagia títulos de capítulos*.