Exercise 1.2: Translate the following expression
into prefix form:


  
    
      
        5
        +
        4
        +
        (
        2
        −
        (
        3
        −
        (
        6
        +
        
          4
          5
        
        )
        )
        )
      
      
        3
        (
        6
        −
        2
        )
        (
        2
        −
        7
        )
      
    
    .