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