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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
a/x = c/d // - c/d
a/x-(c/d) = 0
a*x^-1 = c*d^-1 // : a
x^-1 = (c*d^-1)/a
-1 < 0
1/(x^1) = (c*d^-1)/a // * x^1
1 = ((c*d^-1)/a)*x^1 // : (c*d^-1)/a
1/((c*d^-1)/a) = x^1
x = 1/((c*d^-1)/a)
x = 1/((c*d^-1)/a)
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