Explain each step of this proof that C(5, 5) + C(6, 5) + C(7, 5) = C(8, 6): Proof. C(5, 5) + C(6, 5) + C(7,5) = C(6, 6) + C(6, 5) + C(7,5) = C(7,6) + C(7,5) = C(8,6)

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