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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = (7/6)*x+1 // - (7/6)*x+1
8/x-((7/6)*x)-1 = 0
(-7/6)*x+8/x-1 = 0
8*x^-1-7/6*x^1-1*x^0 = 0
(8*x^0-7/6*x^2-1*x^1)/(x^1) = 0 // * x^2
x^1*(8*x^0-7/6*x^2-1*x^1) = 0
x^1
(-7/6)*x^2-x+8 = 0
(-7/6)*x^2-x+8 = 0
DELTA = (-1)^2-(4*8*(-7/6))
DELTA = 115/3
DELTA > 0
x = ((115/3)^(1/2)+1)/(2*(-7/6)) or x = (1-(115/3)^(1/2))/(2*(-7/6))
x = -3/7*((115/3)^(1/2)+1) or x = -3/7*(1-(115/3)^(1/2))
x in { -3/7*((115/3)^(1/2)+1), -3/7*(1-(115/3)^(1/2))}
x in { -3/7*((115/3)^(1/2)+1), -3/7*(1-(115/3)^(1/2)) }
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