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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-1)/3 = 10 // - 10
(x^-1)/3-10 = 0
1/3*x^-1 = 10 // : 1/3
x^-1 = 30
-1 < 0
1/(x^1) = 30 // * x^1
1 = 30*x^1 // : 30
1/30 = x^1
x = 1/30
x = 1/30
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