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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
68.09 = -189.7/x // + -189.7/x
68.09-(-189.7/x) = 0
189.7*x^-1+68.09 = 0
189.7*x^-1 = -68.09 // : 189.7
x^-1 = -0.35893516
-1 < 0
1/(x^1) = -0.35893516 // * x^1
1 = -0.35893516*x^1 // : -0.35893516
-2.78601851 = x^1
x = -2.78601851
x = -2.78601851
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