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Pick any number.
Multiply by 6.
Add 13.
Subtract 7.
Divide 3.
Divide 2.
Then subtract by the original number you chose.
Your result will always be 1.
Tell a friend to mentaly multiply their age by 2.
Tell them to add 14 then divide 2.
Ask your friend what number they currently have.
Now, you mentally subtract 7 from the number they tell you, then you'll know your friend's age.
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