Use the summation notation to rewrite the following expression. 7 (7 − 1³) − (7 − 2³) + (7 − 3³) − (7 − 4³) + (7 − 5³) − (7 − 6³) + (7 − 7³) = Ĺ (7 − ( − 1) ¹. k³) − − − − k = 1

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