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p² - 6p = 15/2
(p - 3)² - 9 = 15/2
(p - 3)² = 15/2 + 9
(p - 3)² = 15/2 + 18/2
(p - 3)² = 33/2
(p - 3) = + √33/2
p = 3 + √33/2