A problem by d w

Level pending

\(1.\quad a=b\\ 2.\quad { a }^{ 2 }=ab\\ 3.\quad { a }^{ 2 }-{ b }^{ 2 }=ab-{ b }^{ 2 }\\ 4.\quad (a-b)(a+b)=b(a-b)\\ 5.\quad a+b=b\\ 6.\quad b+b=b\\ 7.\quad 2b=b\\ 8.\quad 2=1\)

Which line is the mistake found in?

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