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-> 2x(kuadrat) -x -8x + 4 = 0
-> x(2x-1) .-4(2x-1) = 0
-> (x-4) . (2x-1) = 0
-> x-4 = 0 -> x = 4
2x-1 = 0 -> 2x = 1 -> x = 1/2