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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y/x = 9 // - 9
y/x-9 = 0
x^-1*y = 9 // : y
x^-1 = 9/y
-1 < 0
1/(x^1) = 9/y // * x^1
1 = x^1*(9/y) // : 9/y
1/(9/y) = x^1
x = 1/(9/y)
x = 1/(9/y)
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