<?xml version="1.0" encoding="UTF-8"?>
<math xmlns="http://www.w3.org/1998/Math/MathML">
   <msub>
      <mi>P</mi>
      <mi>x</mi>
   </msub>
   <mo>=</mo>
   <mi>P</mi>
   <mo>-</mo>
   <mfenced close="}" open="{">
      <mrow>
         <mi>a</mi>
         <mo>∣</mo>
         <mi>a</mi>
         <mo>≥</mo>
         <mi>x</mi>
      </mrow>
   </mfenced>
</math>
