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X can be a number.
X is a letter.
X is ten, as the Romans do
X is a dying website
X marks the spot.
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Let x be any number. => x is a number. QED.
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X can be a number.
X is a letter.
X is ten, as the Romans do
X is a dying website
X marks the spot.
Permanently Deleted
Let x be any number. => x is a number. QED.