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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*y)/x = 2/3 // - 2/3
(3*y)/x-(2/3) = 0
(3*y)/x-2/3 = 0
3*x^-1*y = 2/3 // : 3*y
x^-1 = 2/9*y^-1
-1 < 0
1/(x^1) = 2/9*y^-1 // * x^1
1 = 2/9*x^1*y^-1 // : 2/9*y^-1
9/2*y = x^1
x = 9/2*y
x = 9/2*y
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