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