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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
22/60-x = 2/x // - 2/x
22/60-x-(2/x) = 0
22/60-x-2*x^-1 = 0
11/30*x^0-1*x^1-2*x^-1 = 0
(11/30*x^1-1*x^2-2*x^0)/(x^1) = 0 // * x^2
x^1*(11/30*x^1-1*x^2-2*x^0) = 0
x^1
(11/30)*x-x^2-2 = 0
(11/30)*x-x^2-2 = 0
DELTA = (11/30)^2-(-2*(-1)*4)
DELTA = -7079/900
DELTA < 0
x in { }
x belongs to the empty set
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