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