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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16.666/x = 10 // - 10
16.666/x-10 = 0
16.666*x^-1 = 10 // : 16.666
x^-1 = 0.600024
-1 < 0
1/(x^1) = 0.600024 // * x^1
1 = 0.600024*x^1 // : 0.600024
1.6666 = x^1
x = 1.6666
x = 1.6666
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