Problem. What number did I think about?

I am thinking of a number,if you add 2 you will get 9. What is my number? Fill in here

Exemple !

I am thinking of a number, if you add 4 you will get 13. What is my number?

Solution. The number I was thinking about equals 13 - 4 = 9. The solution is found by going through the problem backwards which means that from the final result we have to subtract the added number.

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