FullSimplify[((2(p^k - 1)/(p^(k+1) - 1))) + (((p^k) (p - 1))/(p^k - 1))]FullSimplify[((2(p^k - 1)/(p^(k+1) - 1))) + (((p^k) (p - 1))/(p^k - 1))]

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