I can read your mind

Logic Level 1

Think of any finite number.\large{\text{Think of any finite number.}}

Add 21.
Double it.

Remember it.\large{\text{Remember it.}}

Now take your original number again.
Half it.
Subtract 42.

Remember it.\large{\text{Remember it.}}

Now take your second result and subtract it from your first result four times.

Enter your answer\large{\text{Enter your answer}}

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