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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16667.9/x = 106.294 // - 106.294
16667.9/x-106.294 = 0
16667.9*x^-1 = 106.294 // : 16667.9
x^-1 = 0.00637717
-1 < 0
1/(x^1) = 0.00637717 // * x^1
1 = 0.00637717*x^1 // : 0.00637717
156.80936842 = x^1
x = 156.80936842
x = 156.80936842
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