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