title: conversion from infix to prefix
body: <p>I am preparing for an exam where i couldn't understand the convertion of infix notation to polish notation for the below expression:</p>
  
  <pre><code>(a–b)/c*(d + e – f / g)
  </code></pre>
  
  <p>Can any one tell step by step how the given expression will be converted to prefix?</p>