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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*y)/x = -9 // + 9
(3*y)/x+9 = 0
3*x^-1*y = -9 // : 3*y
x^-1 = -3*y^-1
-1 < 0
1/(x^1) = -3*y^-1 // * x^1
1 = -3*x^1*y^-1 // : -3*y^-1
1/(-3*y^-1) = x^1
x = 1/(-3*y^-1)
x = 1/(-3*y^-1)
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