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

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

What happened when the wheel was invented?

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Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

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One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

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Can you solve the maths in the below-given picture equation?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?