Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

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Note- Square can be of different sizes.

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Also, something wrong is associated with the word.

Can you name it?

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What does the below mathematical rebus mean?

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Which Burger Is Different in below image?