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