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b² - 4ac = 0
(8 - 2m)² - 4(1 - m)(12) = 0
64 - 32m + 4m² - 48 + 48m = 0
4m² + 16m + 16 = 0
--------------------------- ÷ 4
m² + 4m + 4 = 0
(m + 2)(m + 2) = 0
m = -2