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8x² - 2x = 1
8x² - 2x - 1 = 0
x = (-b±√(b² - 4ac)) / 2a
= (-(-2)±√((-2)² - 4*8*(-1))) / (2*8)
= (2±6)/16
x₁ = (2+6)/16 = 1/2
x₂ = (2-6)/16 = -1/4
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