| 
 
  Start with the given equation. 
 
 
 
  Subtract  from both sides. 
 
 
 
  Subtract  from both sides. 
 
 
 
  Combine like terms on the left side. 
 
 
 
  Combine like terms on the right side. 
 
 
 
  Divide both sides by  to isolate  . 
 
 
 
  Reduce. 
 
 
 ----------------------------------------------------------------------
 
 Answer:
 
 So the solution is
   
 
 |