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1+1=1
We start with a simple equation:
a = b
Multiply both sides by a:
a? = ab
Subtract b? from both sides:
a? - b? = ab - b?
Factor:
(a + b)(a - b) = b(a - b)
Drop (a-b) term from both sides:
a + b = b
Since a=b, substitute a for b:
a + a = a
if a=1, then 1+1=1
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