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What is wrong with the following "proof"?
Let a=b=1a = b=1a=b=1, then a+b=b.a+b=b.a+b=b.
Conclusion: By substituting in a=b=1, a = b = 1,a=b=1, we have 1+1=1 ⟹ 2=1.1+1 = 1 \implies 2 = 1.1+1=1⟹2=1.
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