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Start with n, then you get;

Add 17: n + 17

Double it: 2n + 34

Subtract 4: 2n + 30

Double it: 4n + 60

Add 20: 4n + 80

Divide by 4: n + 20

Subtract 20: n

which is where you started.

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Q: How does this work Pick a number any number add 17 double it subtract 4 double it add 20 divide by 4 and subtract 20 You end up with your original answer. How?
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