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