title: how to to sum each rows  in excel?
body: <p>how to make the formula effect on the whole sheet. </p>
  
  <p>the format is : get each lines number sum. then substract some numbers.</p>
  
  <p>eg: there are 100 lines records.  how to make the formula effects on each lines?</p>
  
  <p>namely :  <code>A1+B1+C1+D1+</code>....equals a number, then using the number-20 -15....</p>
  
  <p>each line using the same way,  thank you.</p>