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Elementary Subtraction

Trick brain teasers appear difficult at first, but they have a trick that makes them really easy.

 

Puzzle ID:#8041
Fun:*** (2.75)
Difficulty:** (1.42)
Category:Trick
Submitted By:Wolf**

 

 

 



How can you perform a subtraction on seven so that the result will be even, but without subtracting any odd numbers?




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