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Need help proving binary operation = and showing commutative and associative

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6. Let A be a set and let * and o be unital binary operations on A such that
(axb) o(c*d) = (aoc)*(bod)
for all a, b, c, d E A. Prove that * = o, and that is commutative and associative
[Hint: start by proving that the unit elements * and o are equal.]

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