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p² + 2p - 2/3 = 0 ⇒ bagi kedua ruas dengan 3
p² + 2p = 2/3
(p + 1)² - 1 = 2/3
(p + 1)² = 2/3 + 1
(p + 1)² = 2/3 + 3/3
(p + 1)² = 5/3
p + 1 = + √5/3
p = + √5/3 - 1