(n+5)² - (n-5)² = (n + 5 + n - 5)(n + 5 - n + 5) = 2n * 10 = 20n
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(n+5)² - (n-5)² = (n + 5 + n - 5)(n + 5 - n + 5) = 2n * 10 = 20n