Gavin : a = b
a2 = ab
a2 – b2 = ab – b2
(a+b)(a-b) = b(a-b)
(a+b) = b
a + a = a
2a =
a
Gavin : a = b
a2 = ab
a2 – b2 = ab – b2
(a+b)(a-b) = b(a-b)
(a+b) = b
a + a = a
2a =
a
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