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

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

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How did he managed to do it?

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If eleven plus two equals one, what does nine plus five equal?

10+10 and 11+11 can give you the same answer.

Explain how?