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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-4/x = (2/3)*x-6 // - (2/3)*x-6
6-((2/3)*x)-4/x = 0
(-2/3)*x-4/x+6 = 0
6*x^0-2/3*x^1-4*x^-1 = 0
(6*x^1-2/3*x^2-4*x^0)/(x^1) = 0 // * x^2
x^1*(6*x^1-2/3*x^2-4*x^0) = 0
x^1
(-2/3)*x^2+6*x-4 = 0
(-2/3)*x^2+6*x-4 = 0
DELTA = 6^2-(-4*4*(-2/3))
DELTA = 76/3
DELTA > 0
x = ((76/3)^(1/2)-6)/(2*(-2/3)) or x = (-(76/3)^(1/2)-6)/(2*(-2/3))
x = -3/4*((76/3)^(1/2)-6) or x = 3/4*((76/3)^(1/2)+6)
x in { -3/4*((76/3)^(1/2)-6), 3/4*((76/3)^(1/2)+6)}
x in { -3/4*((76/3)^(1/2)-6), 3/4*((76/3)^(1/2)+6) }
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