### What's Wrong?

Let a = b

Multiply by a a.a = a.b

Subtract b.b a.a - b.b = a.b - b.b

Factor (a+b)(a-b) = b(a-b)

Divide by (a-b) a+b = b

Now since a=b 2b = b

Which means that 2 = 1

What is wrong with this solution?

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