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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-((10/3)*x) = 1/9 // - 1/9
1/x-((10/3)*x)-(1/9) = 0
(-10/3)*x+1/x-1/9 = 0
1*x^-1-10/3*x^1-1/9*x^0 = 0
(1*x^0-10/3*x^2-1/9*x^1)/(x^1) = 0 // * x^2
x^1*(1*x^0-10/3*x^2-1/9*x^1) = 0
x^1
(-10/3)*x^2+(-1/9)*x+1 = 0
(-10/3)*x^2+(-1/9)*x+1 = 0
DELTA = (-1/9)^2-(1*4*(-10/3))
DELTA = 1081/81
DELTA > 0
x = ((1081/81)^(1/2)-(-1/9))/(2*(-10/3)) or x = (-(-1/9)-(1081/81)^(1/2))/(2*(-10/3))
x = -3/20*((1081/81)^(1/2)+1/9) or x = -3/20*(1/9-(1081/81)^(1/2))
x in { -3/20*((1081/81)^(1/2)+1/9), -3/20*(1/9-(1081/81)^(1/2))}
x in { -3/20*((1081/81)^(1/2)+1/9), -3/20*(1/9-(1081/81)^(1/2)) }
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