9=119=11 !!!

Level 2

Line 1: 99=9999=99

Line 2: 18081=220121180-81=220-121

Line 3: 81180=12122081-180=121-220

Line 4: 922910+102=11221110+1029^2-2\cdot9\cdot10+10^2=11^2-2\cdot11\cdot10+10^2

Line 5: (910)2=(1110)2(9-10)^2=(11-10)^2

Line 6: 910=11109-10=11-10

Cancelling 10-10 from both sides, we obtain 9=119=11

In which line I did the mistake?

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