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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = (4/3)*x-1 // - (4/3)*x-1
1/x-((4/3)*x)+1 = 0
(-4/3)*x+1/x+1 = 0
1*x^-1-4/3*x^1+1*x^0 = 0
(1*x^1-4/3*x^2+1*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^1-4/3*x^2+1*x^0) = 0
x^1
(-4/3)*x^2+x+1 = 0
(-4/3)*x^2+x+1 = 0
DELTA = 1^2-(1*4*(-4/3))
DELTA = 19/3
DELTA > 0
x = ((19/3)^(1/2)-1)/(2*(-4/3)) or x = (-(19/3)^(1/2)-1)/(2*(-4/3))
x = -3/8*((19/3)^(1/2)-1) or x = 3/8*((19/3)^(1/2)+1)
x in { -3/8*((19/3)^(1/2)-1), 3/8*((19/3)^(1/2)+1)}
x in { -3/8*((19/3)^(1/2)-1), 3/8*((19/3)^(1/2)+1) }
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