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(2x - 4) (2x + 1) / 2 = 0
(x - 2) (2x + 1) = 0
x = 2 dan 2x + 1 = 0
2x = -1
x = - 1/2
Dengan demikian:
2x + 1 = 0
x = -1/2 (Akar pertama)
x - 2 = 0
x = 2 (Akar kedua)
Sehingga, akarnya adalah:
x = -1/2 dan 2