1
there is a "proof" using only one variable
a^2 - a^2 = a^2 - a^2
a(a-a)=(a+a)(a-a)
a=a+a
1=2
same trick (dividing by zero)
a^2 - a^2 = a^2 - a^2
a(a-a)=(a+a)(a-a)
a=a+a
1=2
same trick (dividing by zero)
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