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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(1/x) = 11/30 // - 11/30
x-(1/x)-(11/30) = 0
x-x^-1-11/30 = 0
1*x^1-1*x^-1-11/30*x^0 = 0
(1*x^2-11/30*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-11/30*x^1-1*x^0) = 0
x^1
x^2+(-11/30)*x-1 = 0
x^2+(-11/30)*x-1 = 0
DELTA = (-11/30)^2-(-1*1*4)
DELTA = 3721/900
DELTA > 0
x = ((3721/900)^(1/2)-(-11/30))/(1*2) or x = (-(-11/30)-(3721/900)^(1/2))/(1*2)
x = 6/5 or x = -5/6
x in { -5/6, 6/5}
x in { -5/6, 6/5 }
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