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View Thread: Math Quiz: 9 is number one

when
a = b
multiply both sides by 8a
8a^2 = 8ab
add (a^2  9ab) to both sides
8a^2 + (a^2  9ab) = 8ab + (a^2  9ab)
simplify them to
9(a^2  ab) = (a^2  ab)
divide both sides by (a^2  ab)
9 = 1