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(5n - 2)(2n - 1)(2n - 1)
(5n - 2)(4n² - 2n - 2n + 1)
(5n - 2)(4n² - 4n + 1)
20n³ - 20n² + 5n - 8n² + 8n - 2
20n³ - 20n² - 8n² + 5n + 8n - 2
20n³ - 28n² + 13n - 2