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