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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(10/3)*x-4 = -1/x // + -1/x
(10/3)*x-(-1/x)-4 = 0
(10/3)*x+x^-1-4 = 0
10/3*x^1+1*x^-1-4*x^0 = 0
(10/3*x^2-4*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(10/3*x^2-4*x^1+1*x^0) = 0
x^1
(10/3)*x^2-4*x+1 = 0
(10/3)*x^2-4*x+1 = 0
DELTA = (-4)^2-(1*4*(10/3))
DELTA = 8/3
DELTA > 0
x = ((8/3)^(1/2)+4)/(2*(10/3)) or x = (4-(8/3)^(1/2))/(2*(10/3))
x = 3/20*((8/3)^(1/2)+4) or x = 3/20*(4-(8/3)^(1/2))
x in { 3/20*(4-(8/3)^(1/2)), 3/20*((8/3)^(1/2)+4)}
x in { 3/20*(4-(8/3)^(1/2)), 3/20*((8/3)^(1/2)+4) }
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