title: boolean algebra simplification provided equation
body: <p>i  have this one</p>
  
  <p>OM5= NOT ( A OR (B AND C)) OR D</p>
  
  <p>i provided i photo of it.
  <a href="http://i.stack.imgur.com/opS1I.png" rel="nofollow">http://i.stack.imgur.com/opS1I.png</a></p>
  
  <p>I used different calcs that were online and all gave me this result
  <a href="http://www.wolframalpha.com/input/?i=not+(a+or+b%26%26c)+or+d" rel="nofollow">http://www.wolframalpha.com/input/?i=not+(a+or+b%26%26c)+or+d</a> like the wolframalpha one!</p>
  
  <p>But when i did it with my hand i had different results.</p>
  
  <p>the result was  NOT(A) AND ( NOT(B) OR NOT(C) OR D )</p>