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  Start with the given equation. 
 
 
 
  Combine like terms on the left side. 
 
 
 
  Subtract  from both sides. 
 
 
 
  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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