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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-1.68/x = -0.08 // + 0.08
0.08-1.68/x = 0
-1.68*x^-1 = -0.08 // : -1.68
x^-1 = 0.04761905
-1 < 0
1/(x^1) = 0.04761905 // * x^1
1 = 0.04761905*x^1 // : 0.04761905
20.99999895 = x^1
x = 20.99999895
x = 20.99999895
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