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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*y-(8/x) = 0
3*y-8*x^-1 = 0
-8*x^-1 = -(3*y) // : -8
x^-1 = (-3*y)/(-8)
-1 < 0
1/(x^1) = (-3*y)/(-8) // * x^1
1 = x^1*((-3*y)/(-8)) // : (-3*y)/(-8)
(8*y^-1)/3 = x^1
x = (8*y^-1)/3
x = (8*y^-1)/3
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