Martin the mathemagician says he can read your mind. He tells you to think of any two-digit number.

Add 10 to this number.

Multiply the result by 6.

Subtract 6 from the result.

Divide the number by 3.

Subtract the original number that you thought of.

Add 9 to the result.

Subtract the original number that you thought of.

Martin claims to know your final result. What is this number?

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