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kuadratkan ruas kiri dan kanan
|2x-1|²=4²
4x² -4x + 1 -16 = 0
4x² -4x -15 = 0
(2x -5) (2x + 3) = 0
x = 5/2 dan x = -3/2
2x = 5
x = 5/2
2x-1=-4
2x = 3
x = 3/2