diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/30.n3/10.main/textbook.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/30.n3/10.main/textbook.fr.md
index eb3306d07..573df9bab 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/30.n3/10.main/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/30.n3/10.main/textbook.fr.md
@@ -367,12 +367,12 @@ Exprimée en fonction du facteur de Lorentz $`Gamma`$, elle s'écrit :
 
 $`\left\{\begin{array}{l}
 t'=\Gamma\;\left(t-\dfrac{Vx}{c^2}\right) \\
-x'=\Gamma\;\left(x-Vt}\right) \\
+x'=\Gamma\;\left(x-Vt)\right) \\
 y'=y\\   
 z'=z 
 \end{array}\right.`$
 
-avec $`\Gamma=\drac{1}{\sqrt{1-\dfrac{V^2}{c^2}}}`$
+avec $`\Gamma=\dfrac{1}{\sqrt{1-\dfrac{V^2}{c^2}}}`$
 
 
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