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