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n² - (n + 1)² = 4a + 1
n² - (n² + 2n + 1) = 4a + 1
n² - n² - 2n - 1 = 4a + 1
- 2n = 4a + 2
- n = 2a + 1
n = - 2a - 1
- 2a - 1 y - 2a