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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9*y)/x = 4 // - 4
(9*y)/x-4 = 0
9*x^-1*y = 4 // : 9*y
x^-1 = 4/(9*y)
-1 < 0
1/(x^1) = 4/(9*y) // * x^1
1 = x^1*(4/(9*y)) // : 4/(9*y)
(9*y)/4 = x^1
x = (9*y)/4
x = (9*y)/4
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