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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/3-(1/x) = x // - x
10/3-x-(1/x) = 0
10/3-x-x^-1 = 0
10/3*x^0-1*x^1-1*x^-1 = 0
(10/3*x^1-1*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(10/3*x^1-1*x^2-1*x^0) = 0
x^1
(10/3)*x-x^2-1 = 0
(10/3)*x-x^2-1 = 0
DELTA = (10/3)^2-(-1*(-1)*4)
DELTA = 64/9
DELTA > 0
x = ((64/9)^(1/2)-(10/3))/(-1*2) or x = (-(10/3)-(64/9)^(1/2))/(-1*2)
x = 1/3 or x = 3
x in { 1/3, 3}
x in { 1/3, 3 }
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