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a = (m-1)
b = 4
c = 2m
D = b² - 4ac = 0
⇔ 4² - 4(m-1)(2m) = 0
⇔ 16 - 8m² + 8m = 0
⇔ 8m² - 8m - 16 = 0
⇔ m² - m - 2 = 0
⇔ (m+1)(m-2) = 0
m = -1 atau m = 2