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Maths Problem
1.
a = b
2. a^2 = ab
3. a^2 - b^2 = ab - b^2
4. (a+b)(a-b) = b(a-b)
5. (a+b) = b
6. a + a = a
7. 2a = a
8. 2 = 1
If there are some mistakes, which row is the beginning of the mistakes?
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