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(-a)³ - 2(-a)² - p(-a) + 6 = (-a)³ + (-a)² + (8 - p)(-a) + 10
-a³ - 2a² + ap + 6 = -a³ + a² + ap - 8a + 10
-2a² + 6 = a² - 8a + 10
3a² - 8a + 4 = 0
(3a - 2)(a - 2) = 0
a = 2/3 atau a = 2