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x₁ = x₂
x₁ - x₂ = 0
D = 0
b² - 4ac = 0
16p² - 4(p - 1)(5p + 6) = 0
16p² - 4(5p² + p - 6) = 0
- 4p² - 4p + 24 = 0
p² + p - 6 = 0
(p + 3)(p - 2) = 0
p = - 3 atau p = 2