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p² - 6p - 18/5 = 0 ⇒ bagi kedua ruas dengan 5
p² - 6p = 18/5
(p - 3)² - 9 = 18/5
(p - 3)² = 18/5 + 9
(p - 3)² = 63/5
(p - 3) = + √63/5
p = 3 + √63/5