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a² - 4a + 4 + p = a² - 2a + 1 + 4a - 4
a² - 4a + 4 + p = a² + 2a - 3
a² - a² - 4a - 2a + 4 + 3 = -p
-6a + 7 = -p
6a - 7 = p
a² - 4a + 4 + p = a² - 2a + 1 + 4a - 4
p = a² - a² - 2a + 4a + 4a + 1 - 4 - 4
p = 6a - 7