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Goal: Add the 3 numbers on each line, and all the sums of the lines must be equal.    
 
Hint: The magic sum is the hint. Divide the magic sum by 3 and you will get the value (number) that must be in the center in order to complete the puzzle.    
 
Directions  
    - To start a new game, click on the New Puzzle button. 
 
    - Click on a bubble on the outside to swap the number positions.  
 
    - A solid bubble means a valid number placement on the line.   
 
 
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