diff --git a/optimization/exercises/singVarCalcOptimization6.tex b/optimization/exercises/singVarCalcOptimization6.tex
index 38a372924..0f47975a9 100644
--- a/optimization/exercises/singVarCalcOptimization6.tex
+++ b/optimization/exercises/singVarCalcOptimization6.tex
@@ -49,8 +49,7 @@
 We now express the area as the function of $x$.
 
 $A(x)=\answer{x}\cdot(100-2x)$
-\end{hint}
-\begin{hint}
+
 So, we have to find the global maximum of the function $A$, given by
 
 $A(x)=100\cdot\answer{x}-2x^2$
@@ -65,8 +64,6 @@
 
 it follows that  the function $A$ has its only critical point at $x=\answer{25}$.
 
-\end{hint}
-\begin{hint}
 We have to evaluate $A$ at the end points and the critical point.
 
 $A(0)=\answer{0}$