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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(y^1)/3 = 2/x // - 2/x
(y^1)/3-(2/x) = 0
y/3-2*x^-1 = 0
-2*x^-1 = -(1/3*y) // : -2
x^-1 = 1/6*y
-1 < 0
1/(x^1) = 1/6*y // * x^1
1 = 1/6*x^1*y // : 1/6*y
6*y^-1 = x^1
x = 6*y^-1
x = 6*y^-1
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