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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 0.007 // - 0.007
1/x-0.007 = 0
1*x^-1 = 0.007 // : 1
x^-1 = 0.007
-1 < 0
1/(x^1) = 0.007 // * x^1
1 = 0.007*x^1 // : 0.007
142.85714286 = x^1
x = 142.85714286
x = 142.85714286
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