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Mathematics, 09.10.2019 03:50 Tirone

I'm picking a number between 1-20. i add 5, then i times the number by 3. lastly i takeaway it by 15. my answer is 42.
what was my beginning number?

clue: do the opposite. 42 add

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Answers: 1

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I'm picking a number between 1-20. i add 5, then i times the number by 3. lastly i takeaway it by 15...

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