\(9=11 \)!!!

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Line 1: \(99=99\)

Line 2: \(180-81=220-121\)

Line 3: \(81-180=121-220\)

Line 4: \(9^2-2\cdot9\cdot10+10^2=11^2-2\cdot11\cdot10+10^2\)

Line 5: \((9-10)^2=(11-10)^2\)

Line 6: \(9-10=11-10\)

Cancelling \(-10\) from both sides, we obtain \(9=11\)

In which line I did the mistake?

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