diff --git a/ch05_wallets.adoc b/ch05_wallets.adoc
index 54751770..7a2ddc54 100644
--- a/ch05_wallets.adoc
+++ b/ch05_wallets.adoc
@@ -143,13 +143,38 @@ point (_G_):
 It's possible to create a derived key pair, called a child key pair, by
 simply adding the same value to both sides of the equation:
 
-
+////
 [latexmath]
 ++++
 \begin{equation}
 K + (123 \times G) =\!\!\!= (k + 123) \times G
 \end{equation}
 ++++
+////
+
+++++
+<div data-type="equation">
+<math xmlns="http://www.w3.org/1998/Math/MathML" alttext="upper K plus left-parenthesis 123 times upper G right-parenthesis equals equals left-parenthesis k plus 123 right-parenthesis times upper G" display="block">
+  <mrow>
+    <mi>K</mi>
+    <mo>+</mo>
+    <mo>(</mo>
+    <mn>123</mn>
+    <mo>×</mo>
+    <mi>G</mi>
+    <mo>)</mo>
+    <mo>==</mo>
+    <mo>(</mo>
+    <mi>k</mi>
+    <mo>+</mo>
+    <mn>123</mn>
+    <mo>)</mo>
+    <mo>×</mo>
+    <mi>G</mi>
+  </mrow>
+</math>
+</div>
+++++
 
 
 [TIP]