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General - 0.9999.... = 1.0 - View Post

SuperMarioWorld said:

the step 'subtract x' is a trick. you are treating x as a constant not a variable. so when you say subtract x it means subtract 0.99999 therefore your proof doesn't really hold up mathematically. its a trick

x = 0.999... and therefore 'subtract x' is the same thing as 'subtract 0.999...'. You can operate on both sides of an equation; the form you operate on each side is up to you to decide as long as both forms are equal. Besides, your point about treating x as a constant instead of a variable doesn't make much sense. x is x and it has a known value; what's the problem?

Oh I get it. You're just trying to mess with us.